High schooler Matsuri has an unexpected encounter with her brother’s friend, Asahi-sempai, who also happens to be a popular boy at her school. From then on, Asahi-sempai makes passes at her at school or even at her own house! Wherever Matsuri might be, there’s just no escaping him… Every day with the somewhat perverse Asahi-sempai is an unbelievably stimulating experience for Matsuri, and she can’t help but be flustered!!
Summer vacation has finally arrived! Matsuri works up the courage to ask Asahi-sempai to go with her to a fireworks festival but ends up not being able to go because she has remedial classes!! But just as Matsuri's feeling down in the dumps, she receives a surprise present! Later on, when her brother can't go see a movie due to a cold, Matsuri goes with Asahi-sempai in his place, and wherever they go, be it the cinema or the theme park, Asahi-sempai teases and flirts with her ...