Kurokiya Ruu is on the verge of repeating a year so her childhood friend Tadashi Tadao (whose name literally means straightforward man) steps up to teach her. However, they end up not getting any studying done as she uses this situation to try and seduce

Yuusuke, a 7th grader, is interested in his friend's older sister for various reasons.The older sister, while a little strange, is a kind and caring girl.She's mysterious, but is popular with everyone.This is an ordinary comedy about Mayuri-san's myste