Sheena thought Mimi was terrifying when they first met. One ordinary day together changes everything, leading to a friendship that neither of them expected.
I Want to Love You Till Your Dying Day Episode 3 starts with a reminder of the harsh reality behind the girls' everyday lives. The facility is introduced as an orphanage that takes in children with nowhere else to go while secretly training them for war under the official name of the National Warfare Sorcery Weapon Training Institute. Although everyone simply calls it "school," the opening immediately reminds viewers that every lesson and every friendship exists under the shadow of battle.
Morning arrives with Mimi enthusiastically waking Sheena in her own energetic way, nearly crushing her before Sheena asks to be awakened more normally next time. Living together has allowed Sheena to discover sides of Mimi that no one else really sees. Despite being surrounded by rumors that describe her as a mysterious secret weapon, Mimi behaves like an ordinary, carefree girl. Sheena has learned that her roommate constantly oversleeps, forgets basic things like her socks, pays almost no attention to her appearance, and needs help getting ready before class. Instead of acting like a legendary warrior, Mimi comes across as someone who relies on others for the simplest everyday tasks.
The episode continues to contrast Mimi's personality with her reputation during class. While Sheena struggles to earn only average marks in mathematics, Mimi effortlessly earns perfect scores in history despite having weaknesses in other subjects. Sheena realizes that Mimi is full of contradictions. Even the relationship between Mimi and Ms. Fran feels unusual, as their conversations resemble those of a caring parent and child more than a teacher and student. Ms. Fran checks on Mimi's health with familiar affection while patiently dealing with her playful attitude.
That peaceful atmosphere disappears the moment an announcement echoes through the school. Several students are ordered to report for deployment, and Mimi is among those called to the front. Instead of showing fear, she happily tells Sheena she'll be back later before leaving with a bright smile. Watching her walk toward another battlefield so cheerfully leaves Sheena confused. She can't understand what she's supposed to feel as someone she barely knows heads toward a life-or-death mission without hesitation.
Unable to stop thinking about Mimi, Sheena spends the rest of the day questioning what she has witnessed. She remembers hearing Mimi admit that she dislikes pain, making it even harder to understand why she always seems happy before battle. During lunch, Ari and Seiran notice Sheena's distracted mood and invite her to eat with them. Their conversation begins casually, with the girls joking about Sheena's love of rice and explaining how Mimi started calling her the "rice ball girl" after Sheena shared homemade rice balls with her before they became classmates. The lighthearted exchange briefly eases the tension surrounding Mimi's deployment.
The discussion soon turns back to Mimi. Ari reminds Sheena how impressive Mimi was during the mock battle, while Seiran awkwardly admits that even she couldn't deny Mimi's abilities. They also reveal that Mimi really did heal Sheena with restoration magic after insisting on treating her injuries herself. Hearing that confirmation surprises Sheena because she had been unsure whether Mimi had actually healed her. The revelation gives Sheena another reason to reconsider the first impression she formed of her unusual roommate.
Ari then asks a question that catches Sheena completely off guard: does she hate Mimi? Although Sheena immediately says she doesn't, she struggles to explain the complicated emotions she has been carrying ever since they first met. She finally admits that seeing Mimi return from battle covered in other people's blood while smiling so naturally frightened her. Even knowing the academy exists during wartime, Sheena couldn't understand how someone could smile after fighting. Those feelings made her instinctively keep her distance from Mimi, leaving her wondering whether that made her a terrible person.
Rather than judging her, Ari gently points out that anyone might react the same way. She reminds Sheena that Mimi also gets hurt during battles and openly admits that she hates pain. That simple confession makes Sheena realize Mimi may not be as different from everyone else as she first believed. However, the conversation takes another unexpected turn when Ari mentions the rumors surrounding Mimi. According to stories passed around the school, Mimi is an immortal secret weapon who can never die regardless of how badly she's injured and can continue fighting endlessly. No one claims to know whether the rumors are true, but simply hearing them leaves Sheena speechless.
Before Sheena can process everything, word spreads that twelve students have returned safely from deployment while two failed to come back. The announcement reminds everyone how ordinary death has become inside the academy. Prayer time for the fallen is quietly accepted as another part of school life, making the cost of every deployment painfully real. Sheena leaves lunch carrying an even heavier mix of uncertainty, guilt, and concern for Mimi's safety than before.
Picking up from the aftermath of lunch, the episode quietly shifts its focus toward the growing connection between Sheena and Mimi. Ari remarks that Sheena has always kept people at arm's length since arriving at the academy, but she believes Mimi's presence will eventually change that. Seiran worries Ari's comments sound insensitive, yet Ari admits she simply wants to see how this unexpected friendship helps Sheena open up. Even as they tease one another, it's clear both girls are watching the relationship develop with genuine interest.
Elsewhere, the episode briefly follows Ms. Fran as she meets someone returning from the battlefield. Their conversation reveals that collecting Mimi after battle has once again been difficult because of the extensive damage she suffered. Although Ms. Fran scolds her for ignoring instructions and recklessly throwing herself into danger, Mimi casually explains that she only wanted to get home as quickly as possible. Even after returning in terrible condition, she is told to clean herself up before heading back, treating something horrifying as though it were completely routine.
Back at the dormitory, Sheena waits anxiously for Mimi's return. Hours pass, and thoughts of the two missing students refuse to leave her mind. She tries to stop imagining the worst and instead prepares food, convincing herself that Mimi will surely be hungry after coming back. While waiting alone, Sheena reflects on how unfairly she judged Mimi from the moment they met. She realizes that despite Mimi always greeting her with warmth and kindness, fear had constantly pushed her away. Before long, Mimi finally returns safely. Overwhelmed with relief, Sheena immediately asks whether she's hurt. When Mimi says she's fine, Sheena can't hide how happy she is to see her back.
Their reunion quickly turns heartfelt. Sheena apologizes for being distant and thanks Mimi for restoring her injured arm. Rather than dwelling on the apology, Mimi happily celebrates the fact that her healing magic helped someone. The conversation naturally shifts to dinner, where the two bond over their shared love of rice. As they continue eating together, Sheena becomes curious about Mimi's life before joining their class. Mimi quietly reveals that she used to live alone underground in a dark place. Hearing that lonely answer encourages Sheena to ask an even more important question. She wonders whether Mimi would like to become friends.
For Mimi, the offer is life-changing. She repeats the word "friends" in disbelief before revealing that this would be her very first friend. Overjoyed, she throws herself at Sheena in an enthusiastic hug, nearly knocking the breath out of her once again. The emotional moment perfectly mirrors the playful scene that opened the episode, but this time the affection feels completely mutual. What began as an uncomfortable roommate relationship has finally become a genuine friendship.
The following day gives the girls a rare break from classes, allowing them to discover what ordinary friendship looks like. Mimi eagerly asks what friends are supposed to do together, and Sheena lists simple activities like chatting, celebrating birthdays, helping one another, and sharing secrets. She also gently points out that a true friend should be honest, even if that means saying something uncomfortable. Using Mimi's messy habits as an example, Sheena convinces her that spending their day cleaning their room is actually a worthwhile way to enjoy their time together. Although Mimi protests at first, she reluctantly joins in.
Cleaning turns into another chance for Mimi to experience everyday life. Sheena sorts through scattered papers, explains what a laundry room is, and helps wash their bedding. Once everything is finished, Mimi happily flops onto the freshly made bed, amazed by how comfortable it feels. Just as the two prepare to head somewhere else, Ms. Fran suddenly arrives to summon Mimi for another deployment. Sheena asks whether Mimi is being sent back into battle already, and Ms. Fran calmly confirms it before telling her not to worry because Mimi can't die. Those words immediately remind Sheena of the rumors she heard earlier, but she still doesn't know what to believe.
After Mimi leaves once again, Sheena discusses Ms. Fran's statement with Ari and Seiran. They are equally surprised that Ms. Fran openly said Mimi cannot die, wondering whether she simply meant Mimi is incredibly strong. Even so, they admit similar rumors have circulated around the academy for some time. Despite hearing all of this, Sheena chooses to focus on the girl she has come to know instead of the stories surrounding her. To Sheena, Mimi may act childish and carefree, but she still feels like an ordinary girl who spent too much of her life alone and simply needed someone to call a friend.
Night stretches into early morning before Mimi finally returns. Instead of sleeping, Sheena has stayed awake because she didn't want Mimi to come back to a dark, empty room. She proudly shows off the freshly cleaned bed, and Mimi excitedly jumps onto it, delighted by the soft sheets. As Sheena notices blood still staining Mimi's clothes, the cost of another deployment quietly settles over the scene. Remembering their earlier conversation, Mimi decides it's finally time to share a secret that she says only a true friend can hear. She promises to tell Sheena everything the following day.
The episode ends with Mimi rushing Sheena away the next day so they can exchange secrets in private before anyone interrupts them. Feeling honored to be Mimi's very first friend, Sheena happily follows along. After making sure nobody else is nearby, Mimi reminds Sheena to keep what she's about to hear completely confidential. She then calmly reveals the truth behind every rumor surrounding her, saying that the reason she cannot die is because she is already dead. The shocking confession arrives without any explanation, bringing I Want to Love You Till Your Dying Day Episode 3 to a dramatic and unforgettable close.
I Want to Love You Till Your Dying Day Episode 3 slows the pace to spend meaningful time developing Sheena and Mimi's relationship, and that decision pays off. The quieter slice-of-life moments make their growing friendship feel sincere, while the repeated deployments constantly remind viewers that danger is never far away. Mimi's cheerful personality creates several funny moments, but they're balanced by Sheena's emotional growth and the unsettling mystery surrounding Mimi herself. The final revelation completely changes how viewers see everything that came before, making this an emotionally satisfying episode with a powerful ending that leaves a lasting impression.

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