Partner(パートナー) is a shōjo manga by Miho Obana. Partner stands out from Obana's other work as much darker than her old work. 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...