あした、人生（いのち）が終わるとしたら

Tsumugi Shiraishi, a girl who attends a certain prestigious high school, had vague thoughts about wanting to die. Her studies and athletics are not so good, putting her below average. She has no dreams, no goals, and no ambitions. Still, adults say that she should work hard for her future, so she tries to face a "future" that she can't see. All she could do was study hard in order to get good grades. But then came an important mock exam that would affect her career path. During that mock exam, Tsumugi ended up making a big mistake... [Translated from the game's readme]