Hajime leads an unremarkable life as an undertaker, but he likes his job and has no reason to complain. Nor can he complain of being always called "onii-san" by one of the top star actresses in the country, ...

Ren Nakazato, who has just entered high school, visits the old school building to experience the "Top Exploration Club," which is rumored to be studying the school's seven wonders. There, Ren meets three fir...