お前のパンツは何色だ！？

On Takato’s first day at Kojou Academy, an energetic girl Mitsuna ordered him to use his genius brain only for her sake for the next three years (and all this while he could see her panties clearly). For Takato who failed to make it into an overseas school of his choice and ending up transferring to Kojou Academy instead, of course he bluntly said no. However, she manages to convince him to join her unofficial club Tateyoko-kai that she is the leader of. The only thing that the Tateyoko-kai does is to "use words to help others". The other club members are just as weird as Mitsuna: masochistic rich girl Yomi, poor girl Shizuku who masturbates everywhere, his childhood friend Sae who’s a stalker no matter how you look at it, and the delusional denpa girl Sako.