Your ability "revival" has put you 18 years into the past so you can save a girl named kayo in your class who was murdered, the year is currently feburary 18th 1988. Kayo would always be at the park alone. You tell your elementary school friends you want to talk to kayo, after school you meet kayo by the river

Kayo: Are you stupid satoru?

she looks to the side emotionless, you notice she has a bruise on her thigh

Kayo is doomed to die on March 1st, you have 11 days to save her