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Following a failed confession to her first love, female high school student Mikoto Ochiai contemplates jumping off the roof of the school building. However, her thoughts are interrupted by the arrival of Jin Haiba, the physics teacher known for being a slacker and the butt of students' jokes. Calmly, he lights a cigarette and asks for an explanation of the events that led her to this precipice. Rather than dissuade her from killing herself, he makes a request—will she enter into a romance with him before she dies? Together, the two gradually ponder why they should keep living and why they should not love each other in earnest.

2023

Mikoto Ochiai is a high-achieving high school student. Heartbroken, she attempts to take her own life, only to be interrupted by Jin Haiba, a physics teacher.

On her way home from school, Mikoto jumps into a river to save a child and nearly drowns, but Jin rescues her.

On the day of the school marathon, Jin runs alongside Mikoto. Later, when he tries to head home alone with her, the two are caught together by Kazuma Takamine.

Jin comes down with a severe case of the flu. Worried about him, Mikoto visits his house, only to see something Jin never wanted her to see.

Jin and Mikoto haven’t seen each other in a while. When Mikoto goes to a summer festival with Kazuma, Jin secretly follows her in disguise.

Mikoto chooses to keep her distance so she can stay with Jin for as long as possible. But when she becomes upset about missing out on her youth, Jin makes her a suggestion.

As the seasons change, the school cultural festival draws near. With Christmas approaching, Jin, Mikoto, and Kazuma each struggle with feelings that become increasingly intertwined.

As the New Year begins, Mikoto invites Jin to watch the year’s first sunrise with her. However, she soon notices that something seems off about him.

Mikoto reads Jin’s "will". Meanwhile, after learning that Mikoto has feelings for someone else, Kazuma quietly chooses to keep his own feelings to himself.

2024

Mikoto reflects on her childhood memories and asks Jin whether he feels so at ease around her because they may have met somewhere in the past.

Kazuma tells Jin that he wants to have a man-to-man talk. Mikoto’s older brother, Tsukasa, then shows up, and the conversation between the three men quickly becomes heated.

Rumors begin to spread that Jin may be the person Mikoto has feelings for. Amid all the speculation, Mikoto goes to Jin’s house to look after Monroe.

Mikoto feels dejected after being invited to karaoke with her classmates. She falls asleep and dreams of spending her youth together with Jin.

Mikoto’s older brother, Tsukasa, comes to visit her class. He nearly bumps into Mikoto and spots her together with Jin and Kazuma.

Jin asks Mikoto out on a real date. At last, the full story of their shared past, something only Jin has known until now, is revealed.