Weighed down by memories she can't shake, high schooler Koyuki Hikawa keeps everyone at arm's length — until three schoolmates draw her out of her shell.

It’s the year 2020, and Mizuho is having the worst 17th birthday ever. Her parents forgot it’s her birthday, she still can’t seem to get close to the senior she likes, and all her school trips and tournaments are canceled thanks to a new disease going around. She’s convinced she’ll never have the kind of youth she’s always dreamt of…until her childhood friend, Kizuki, suddenly asks her out.