18+ Nagi-chan no Yuuutsu

What do phallic toys, a traditional Japanese festival and a pantiless girl in a kimono have in common? Akira and Nagi, of course. Nagi's biggest problem seems to be her horny boyfriend—until the flu and a rectal thermometer set off a new kind of fever in her, a trip to the hot springs, a jug of wine, and a hot four-way orgy. Nagi's at it again, Nagi's friend Yukika assists Akira with his research... on positions from a tantric sex manual, after Akira finally finishes his term paper, long-suffering and neglected Nagi removes her panties, points her ass at him, and begs Akira to screw her silly. It's a sex comic, what do you think happens next!?! Plus: Yukika and her boyfriend visit a public bath and make the Beast With Two Backs.

(Source: MU)

Included one-shots:
Volume 1: Namiko Full Burner, Maids