I Kissed My Girlfriend's Little Sister?! (Kanojo no Imto to Kiss wo Shita. ), a light novel series by author Riku Misora and illustrator Sabamizore, will come to a conclusion with the fourth volume, which will be available on September 14.

The first book of the light novel series is described as follows by Tentai Books:

My girlfriend's younger twin sister has somehow become my new stepsister?!
“You sound really nervous right now. You're just so adorable, bro.”
It's been a month since I've started dating Haruka, my first ever girlfriend. We even finally reached first base today—holding hands!
“What a bad boyfriend you are. To think you're daydreaming about your little sister while you're holding hands with your girlfriend, of all people!”
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.
“It's okay, bro. I look exactly like sis does, right down to… well, you know. I don't blame you at all.”
Her presence adds a new, twisted form of love that tangles itself into our protagonist's passionate love life! He can't possibly tell his girlfriend what's been going on!
Be sure to check out this saucy romcom with a raunchy and rather needy stepsister!

In Japan, the first volume was released by SoftBank Creative in April 2020.


High school prodigies had it easy in another world and Misora's Chivalry of a Failed Knight TV anime versions were both influenced by light book series. High School Prodigies Have It Easy Even in Another World! by Yen Press and Chivalry of a Failed Knight by Sol Press are both being published in English.