My Rainy Days

Three years earlier, Rio discovers she is pregnant as a result of rape. Her mother takes her to a hospital for an abortion. To avoid getting hurt again, Rio turns to compensated dating and soon to extortion and manipulation. This backstory sets up her patterns of risk and hurt that shape her later choices.

Three years earlier, Kouki Ozawa undergoes brain tumor surgery. The tumor is not completely removed, leaving a lingering threat to his health. He is a 35-year-old history professor whose vulnerability remains hidden from Rio at first. This early medical history informs his later decisions and the stakes of their relationship.

Present day at the high school, Rio and her friends Maki and Miho operate a compensated dating scheme and extortion racket. Rio defends Tomoko from Naoko's bullying and then invites Tomoko to join their clique. The manipulation pulls Tomoko deeper into their world and sets up future conflicts.

A photo development store accidentally swaps Rio's photos with those of Kouki Ozawa. Rio arranges a meeting to swap the pictures back. While walking together, Kouki suddenly faints and is rushed to the hospital, beginning their fateful bond.

Rio visits Kouki in the hospital, and the two begin to bond. She stops compensated dating and extortion, and instead tutors him; he begins to care for her. Their relationship deepens into love.

With her history score of 99, Kouki agrees to take Rio on a date. In a library, he kisses her for the first time. The moment marks the shift from mentor-like tutor to romantic interest.

To avoid hurting Rio, Kouki distances himself emotionally. He struggles with his illness and his fear of causing her pain, leading to tension between them.

Naoko returns to class, attempts to stab Tomoko, blaming her for Rio's distance from Naoko. She reveals she was repeatedly raped by her mother's boyfriend, and her mother blamed her after he left. Rio pleads with Naoko not to jump, but Naoko climbs to the school rooftop and dies by suicide after declaring her love for Rio.

Distressed by Naoko's suicide, Rio confesses to Tomoko that she was the one who ordered Naoko to bully her. Tomoko severs ties with Rio, creating a rift in their friendship.

Rio's friends visit her at the hospital after her emotional collapse. Kaori reveals that Kouki has transferred to another university and provides Rio with his new address. This rekindles a connection and sets up later reunions.

Rio and Kouki meet again, and she reveals that three years earlier she became pregnant from rape, and her mother helped with abortion. She explains how prostitution and extortion were coping strategies to avoid getting hurt again, but Kouki's presence makes her believe love is worth the risk.

Kouki agrees to undergo another brain surgery to address the remaining tumor, despite the risk of memory loss. Before the operation, he tells Rio that he loves her, acknowledging the depth of their bond.

Kouki undergoes the later surgery and survives, though his memory of Rio is unclear. He begins life anew, and their relationship continues despite uncertainty.

Some time later, Rio graduates from high school and returns to the hospital to find Kouki. He may not remember her at first, but he agrees to walk her to the train station under his umbrella. After he leaves, he returns to cover her again, and they share a hopeful embrace.