Mochizuki Mifuyu

Sara is a student in a women-only school and has been raised protected and covered from everything. Until one day she crossed paths with a boy as beautiful as he is dangerous…

Kasumi is a cheerful girl and is loved by all her classmates, but she hides a secret: a butterfly-shaped birthmark on her ankle. Naoshi, a gloomy and lonely boy, and Kasumi's childhood friend, is the only one who knows this secret, but the two have not spoken for several years. Kasumi wants to be Naoshi's friend again, but he avoids her… Why?