どうせ、恋してしまうんだ。

High school sophomore Mizuho Nishino is having the worst 17th birthday imaginable. Her crush on a senior seems out of reach, her parents forget the occasion entirely, and a mysterious illness cancels school events, leaving her feeling like her dreams of a sparkling youth are slipping away. But everything changes when her childhood friend, Kizuki Hazawa, suddenly declares himself her "boyfriend candidate." Surrounded by four handsome childhood friends, Mizuho finds herself caught in a whirlwind of emotions, friendships, and unexpected confessions. (Unreviewed summary by Grok 2)