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! 

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

I Kissed My Girlfriend's Little Sister?!: Vol 1 - Light Novel Review - NookGaming

My Stepsister Who Says Go Die Go Die to Me Every Day, Tries to Hypnotize Me to Fall For Her While I Was Sleeping..! - Novel Updates

Disc] My little sister can't be my girlfriend ch. 5 : r/manga

Horikita Suzune Gets Own Manga In Seven Seas February 2023 Solicits

I Kissed My Girlfriend's Little - Takeshi's News Center

Read I Kissed my Girlfriend's Little Sister?! Volume 1 by Riku Misora available from Rakuten Kobo. “We’d better not let my sis see us like this…”,

I Kissed my Girlfriend's Little Sister?! ebook by Riku Misora - Rakuten Kobo

Read I Kissed My Girlfriend's Little Sister ♥ 6 - Oni Scan

Light Novel Like Tensai Joyuu no Osananajimi to, Kiss Scene wo Enjiru Koto ni Natta