Kanojo no Imouto to Kiss wo Shita.

After a month of dating, a boy successfully holds hands with Haruka, his first-ever girlfriend. On the same day, his parents remarry, introducing him to a step-sister who is an exact look-alike of Haruka. Her name is Shigure, and the resemblance is explained by their being twin sisters separated due to family circumstances.

Isinasalin pa — orihinal na teksto sa English.