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! 

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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)