I Want to Love You Till Your Dying Day

An anime television series adaptation produced by Roll2 premiered in July 2026.

At a school that takes in orphaned children and raises them to be magical weapons for war, one morning, a 14-year-old Sheena Totsuki suddenly loses her roommate. Sheena suppresses her grief and tries to act strong, until later that evening when a girl covered in blood approaches her. Despite her injuries, the girl remains cheerful, much to Sheena's confusion. The next day, the girl joins Sheena's class as a new student and introduces herself as Mimi Kagari, while Sheena finds out that Mimi is rumored to be the school's secret weapon as she is seemingly unable to die. The pair become roommates and grow closer despite their different outlooks on their situation within their school.

Sheena Totsuki (トツキ シーナ, Totsuki Shīna) Voiced by: Rie Takahashi (PV, anime) A 14-year-old girl whose magic ability and grades are unremarkable. She hates war and hurting others, and has doubts about her mission within the school. She is the first student to meet Mimi and is disturbed by her cheerful disposition despite being covered in blood from the battlefield. She comes to learn more about Mimi once they are assigned as roommates. Mimi Kagari (カガリ ミミ, Kagari Mimi) Voiced by: Rina Hidaka (PV, anime) A mysterious girl who met Sheena by chance after returning from the battlefield. Despite her young appearance and carefree mannerisms she is rumored to be the school's secret weapon that can never die. She possesses unimaginable power and has no hesitation in killing her enemies. She can revive herself even if she is injured in battle to the point where she no longer retains her human form. Lizzy Seiran (リジィ セイラン, Rīji Seiran) Voiced by: Asami Seto (PV, anime) One of Sheena's classmates and friends. She is earnest and has a strong sense of justice. She is usually with her roommate, Ali, and the pair has strong romantic bond. During her second war mission, after using all her healing potions to save a companion, she's mortally wounded: returned to the campsite, she dies in front of Mimi's eyes. Ali Maud (モード アリ, Mōdo Ari) Voiced by: Yui Ishikawa (PV, anime) Seiran's girlfriend, she's a classmate and friend of Sheena. She is always smiling and has a gentle personality. She has a tendency to speak her thoughts very direct and bluntly. Before arriving at the orphanage, she was a waitress in a brothel. Fran (フラン, Furan) Voiced by: Yumi Uchiyama (anime) The school nurse. She is skilled in healing magic. She looks after Mimi when she returns from battle, however since Mimi always comes back heavily injured, Fran is often annoyed with her. Omi (オミ) Voiced by: Ai Kayano (anime) The teacher of class 14 at the school. A woman who wears glasses. Nino Esther (エスタ 二ノ, Esuta Nino) Voiced by: Haruka Shiraishi (anime) A student from class 16 and a senior of Sheena and her friends. She is frequently seen with bandages and wraps from past injuries. Sheena and Mimi first saw Esther kissing her roommate on the stairs at school, however by the time they were properly introduced to Esther her roommate had since died in battle. Halfred Anhalt (アンハルト・ハルフレズ, Anharuto Harufurezu) Voiced by: Riho Sugiyama (anime) Nicknamed Haru. A student in class 14, she is befriend by Mimi. She has a frank personality and suffers a weak physical condition, getting persistent fevers when in direct sunlight and thus cannot partake in mock-battles at school. She wears a boys uniform and while conflicted about her gender and romantic identity she is encouraged by Fran to take her time working it out.

Written and illustrated by Aono Nachi, I Want to Love You Till Your Dying Day was serialized in Ichijinsha's Comic Yuri Hime from August 2018 to December 2019, before moving to online serialization on both the PixivYurihime page on the Pixiv Comic website and Ichijin Plus. The series has been collected in nine tankōbon volumes as of July 2026. The series is licensed for an English release in North America by Kodansha USA.

An anime television series adaptation was announced on March 2, 2025. It is produced by Roll2, with Takudai Kakuchi originally announced as the director of the series, that however, in February 2026, his credit was changed to "creative advisor". Yasushi Tomoda, originally Kakuchi's assistant director, replaced him as the director, with Nao Enomoto replacing Tomoda's position as assistant director. Jukki Hanada is handling series composition, Kyoko Yufu is designing the characters, and Yukari Hashimoto and Michiru are composing the music. The series premiered on July 7, 2026, on AT-X and other networks. The opening theme is "Amore" by ReoNa, while the ending theme is "Éternel" (エテルネル, Eteruneru; 'French for Eternal') by Sajou no Hana. Crunchyroll is streaming the series.