Shy Satsuki Shinohara's plan for a big high school debut are almost ruined by a pervert on the train, but she's saved by none other than the gangster" student in her class, Yamaguchi-kun. He's already got a bad rap with the other students, and though Satsuki tries to approach him, he seems to always weasel out of her grasp. But she's not one to let a challenge daunt her, and she's out to prove that Yamaguchi-kun is so much more than he's cracked up to be."
“You don’t mind…if we take things further…?” Winter brings the two of them closer… Satsuki can’t stop thinking about Yamaguchi-kun during winter break. She is determined to work hard to become her best self while they are apart! She is ecstatic on the first day of the new semester. That’s when they find themselves spending the night alone together in Satsuki’s room… Wait, how did that happen?!