SEINEN

From MangaScreener:In the world of Noramimi families frequently have "mascots". Funny characters that live with the family and acts as companions to the children until they grow older. Noramimi is one such mascot. Unfortuantely for him, he's of an ogre (well everyone else thinks he's a monk) type and not popular so he's doing his "home stay" with Hello Kids, an agency which sets up mascots with families. He really wishes a family would adopt him though...

This is based on the dating simulation game, Amagami (Gentle Bite).The special focuses on Sae, Ai and Miya, three adolescent girls who are trying to understand their changing bodies and learn how to be "sexy".The chaptered version begins with the story of Tsukasa Ayatsuji, who is the overachieving class representative and planner of the school's Christmas party, and her classmate, Tachibana, who finds himself offering to help her...

Kisaki has a mysterious disease from childhood that turns her into half-tree, half-human.