On the eve of high school, my sister came to my room and suddenly confessed her feelings.

"Big brother, please go out with me!"

My first confession ever, and it's from my sister... Seriously?

Seeing my sister's tears, I couldn't refuse, so I went to the entrance ceremony with my answer still pending.

My sister, who will be attending the same high school.

What am I supposed to do if I date my sister?!

A sweet, flirty romantic comedy between a super-doting sister with incredible communication skills and a kind, ordinary, somewhat lonely big brother. What will happen when they actually try dating?!

And then, one after another, various girls appear who develop feelings for the protagonist, and even a new elementary school-aged sister is born!

Please be warned: If you dislike stories about sisters, you won't find this interesting. We apologize, but if you are not a fan of stories featuring sisters, please refrain from reading this novel. (Lol)

I always wanted a sister like this. I wished my sister were like this. Maybe I *could* love a sister like this...

Reached 2,000 bookmarks, 1.5 million views!, 220,000 unique visitors, and a total rating of 4,700pt. Thank you very much!

I will continue to work hard on updates.

(Also posted on Kakuyomu, Magnet, AlphaPolis, Novelba, and Pixiv)

Illustrations featuring SD characters have been introduced. All regular female characters will appear in chapter 52-1, and others will be added sequentially.

Passed the first round of selection for the HJ Net Novel Award.

Passed the intermediate selection for the 4th Kakuyomu Web Novel Contest.