Nishimura Keisuke is curious about Yamada Aiko. She is the only person who doesn't notice him like all girls do. But he doesn't know the way to get to know her. But his bestfriend, Haibara Reiji, does. As time passes by, watching Reiji and Aiko drives him crazy that he starts to find any way to get to Aiko. And while Keisuke is busy finding way to steal Aiko's attention, Reiji is confused by his ex-fiancé's confession. Let's find out Keisuke, Reiji and Aiko's adventure discovering their first loves in Youth Days!