Good story! Book 1 in a 4 book series, bk2 ~ Kuchibiru ni Amai Doku (Sweet Poison On Our Lips) bk3 ~ Netemo Sametemo'(Even When I'm Asleep,Even When I'm Awake) bk4 ~ Shinnyuu Kinshi no Koi (No Entry Love)
5 chapters. Pretty cute start to a series. #1 Koi no yamai ni tsukeru kusuri #2 sweet poison on our lips (Kuchibiru ni Amai Doku) #3 netemo sametemo (incomplete) #4 shinnyuu kinshi no koi