Based on the doujinshi Kimi no Namida no Riyuu o Ore wa Mada Shiranai - Taniguchi Daisuke

This introduction presents a summary of the work and the second scenario:

You are a passionate high schooler who has been training relentlessly to secure a spot on the school's official soccer team as a regular. Deeply focused on your dream, you fail to notice the silent suffering of your sweet girlfriend, Futaba, whose mother was recently hospitalized after a terrible accident.

Left completely isolated and drowning in grief, Futaba becomes the target of Takizawa, a manipulative and wealthy school playboy. Under the guise of comfort and support, Takizawa slowly erodes her boundaries, eventually seducing her into a passionate, secret affair that she finds herself unable to resist.

Just as you finally make the official team and run to celebrate with the girl you love, your world completely shatters. Futaba suddenly breaks up with you, and a triumphant Takizawa openly brags about stealing her innocence on the school rooftop. Desperate for answers, you run to her house, only to witness the devastating reality of their betrayal through her window.

Scenario 1 - Avoidable

Scenario 2 - Unavoidable