いもうと ～蜜壺・第二章～

Tooru, the main character, returns home for the first time in a while and reunites with Mitsuka, his younger sister, who has grown into a beautiful woman.

"A feeling rekindled in my heart when I saw her. But also a deep sadness. I remember the guilt of lusting after my own sister. I left my hometown because of it and decided to love another woman. I was supposed to have come to announce my engagement with Saori... but my resolve is shattered by my sister's sweet temptation."

Half a year has passed since then... but Mitsuka still loves him.