I Kissed my Girlfriend's Little Sister?! (Light Novel) Manga

It’s been a month since I’ve started dating Haruka, my first ever girlfriend. We even finally reached first base today—holding hands! Today’s also special for a different reason—my dad’s getting remarried, which means I get a new stepsister. Her name is Shigure, and she’s pretty much the spitting image of Haruka. That’s no surprise though, given that she’s actually Haruka’s long-lost twin sister! Due to family circumstances, they were split up at birth. Her presence adds a new, twisted form of love that tangles itself into our protagonist’s passionate love life! 
It’s been a month since I’ve started dating Haruka, my first ever girlfriend. We even finally reached first base today—holding hands! Today’s also special for a different reason—my dad’s getting remarried, which means I get a new stepsister. Her name is Shigure, and she’s pretty much the spitting image of Haruka. That’s no surprise though, given that she’s actually Haruka’s long-lost twin sister! Due to family circumstances, they were split up at birth. Her presence adds a new, twisted form of love that tangles itself into our protagonist’s passionate love life! 

Read I Kissed My Girlfriend's Little Sister ♥ 5 - Oni Scan

Tentai Books Announces Three Rom-Com Light Novels

I Kissed My Girlfriend's Little Sister / Kanojo no Imouto to Kiss wo shita (カノジョの妹とキスをした)

Kanojo no Imouto to Kiss wo Shita.

Read I Kissed My Girlfriend's Little Sister Chapter 1-full-eng-li Online

Boku wa Imōto ni Koi o Suru - Wikipedia

Shitsurengo, Kenaku Datta Osananajimi ga Sato Kashi Mitai ni Amai ~ Sugar After Bitter ~ - Novel Updates

Art] Kanojo no Imouto to Kiss wo shita / I Kissed my Girlfriend's Little Sister?! Vol.4 Light Novel Cover (Final). Release Date is September 14, 2022 in Japan : r/LightNovels

Really Like the Extras from Tentai Books (ImoKiss) : r/LightNovels