I'm Kuniaki Juichi. I attend Yamagara Academy.

Because I'm serious and a top student, everyone calls me "Sensei."

My motto is to be friendly with everyone and enjoy school life to the fullest, but actually, I have a secret…! There's a girl I'm interested in.

Sumine Masuzu, from my class, everyone calls her "Su-chan."

She's a gal, but quiet and downer-ish. Actually, she doesn't study much, so she's apparently in danger of failing.

She lives in the same direction as me. She invited me to go home together today, but…

"Congratulations, you won the hot spring trip!"

Somehow, Su-chan won the grand prize in the raffle we did on our way home!? She said to me, who was surprised.

"Sensei, let's go together?"

My heart is pounding from this invitation from the girl I like! Su-chan presses on when I hesitate, saying it's impossible.

"If I go with Sensei… I might study." "If you come… I'll take your virginity♪"

I nod at that overly-interesting comment…. No preparation possible, a runaway is inevitable. And… a little touching. A four-night, five-day hot spring trip of surprise and healing begins…!!