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I Kissed My Girlfriend’s Little Sister?! (Japanese: カノジョの妹とキスをした。, Hepburn: Kanojo no Imōto to Kiss o Shita) is a Japanese light novel series written by Riku Misora and illustrated by Saba Mizore. SB Creative published the series in four volumes from April 2020 to September 2022. A manga adaptation, illustrated by Kakito Kato, began serialization on the Manga UP! website in May 2022. As of October 2022, the manga’s individual chapters have been collected into a single volume.

Light novel

Written by Riku Misora and illustrated by Saba Mizore, the series began publication under SB Creative‘s GA Bunko light novel imprint on April 14, 2020. The series was completed in its fourth volume, which released on September 14, 2022.

Tentai Books is publishing the series in English.

Volume list

No.	Original release date	Original ISBN	English release date	English ISBN
1	April 14, 2020	978-4-81-560631-2	October 4, 2022	978-8-41-905603-0
2	September 11, 2020	978-4-81-560728-9	—	—
3	September 14, 2021	978-4-81-561225-2	—	—
4	September 14, 2022	978-4-81-561458-4	—	—

Manga

A manga adaptation, illustrated by Kakito Kato, began serialization on Square Enix‘s Manga UP! website on May 28, 2022. As of October 2022, the series’ individual chapters have been collected into a single tankōbon volume.

Volume list

No.	Japanese release date	Japanese ISBN
1	October 6, 2022	978-4-75-758193-7

Reception

In the 2021 edition of the Kono Light Novel ga Sugoi! guidebook, the series ranked eighth in the bunkobon category and fifth in the new work category.

Thomas Knight of NookGaming praised the setting and contrast between the two love interests in a review of the light novel and Tentai Books stated that I Kissed My Girlfriend’s Little Sister?! has sold better than any of their other titles to date in an interview.

カノジョの妹とキスをした。 (Kanojo no Imōto to Kiss o Shita)
I Kissed My Girlfriend’s Little Sister?!
Cover of the first light novel volume
Genre	Romantic comedy
Light novel
Written by	Riku Misora
Illustrated by	Saba Mizore
Published by	SB Creative
English publisher	^NA Tentai Books
Imprint	GA Bunko
Demographic	Male
Original run	April 14, 2020 – September 14, 2022
Volumes	4 (List of volumes)
Manga
Written by	Riku Misora
Illustrated by	Kakito Kato
Published by	Square Enix
Magazine	Manga UP!
Demographic	Shōnen
Original run	May 28, 2022 – present
Volumes	1 (List of volumes)