Aihara Nana is a middle school student who just got a love letter, but she cant stop thinking about her Onii-chan (from Mangaupdates) From Baka-Udates: Kimikiss Sweet Lips is a collection of one-shot stories that tells about the relationship of an ordinary high school boy named Aihara with the 9 heroines from the Kimikiss series. This manga is from the same game and anime adaption.