High-school freshmen and twins, Nae and Moe, and Ken and Takeshi, enjoy their lives as students and close friends. Until Moe suddenly dies in a traffic accident... and her corpse disappears? Between the vanishing corpse and a pharmaceutical corporation, her three remaining friends are struck with the reality that something is amiss in their world...

Included extras/oneshots:

Vol. 1: Seto no Grandma (Published in Ribon Original in '99)

Vol. 1: Partnyaa (Published in Ribon Fuyu-yasumi Otanoshimi Zoukan in '00)