KI-Z-NA
Description
KI-Z-NA is a Japanese erotic visual novel which contains two storylines depending on the player's choice of protagonist at the start of the game.
The first protagonist option is Tomonori Yamatani, a womanizing student with a bad reputation who sets his sights on the pretty girls of the Fujino family. After he starts dating Mie Fujino, he makes a move on her younger sister, Manami, before their mother, Yukiko, gets dragged into the fray upon noticing the changes in her daughters' behavior.
The second protagonist option is Ryou Fujino, the adopted brother of Mie and Manami who has started to become attracted to his step-sisters, especially Mie. When Ryou discovers that Mie has met someone she likes, he starts to work on a plan to claim her for himself.