Asahi is a nerdy high school kid whose quiet life gets turned upside down when his sister's best friend, Hi-chan, starts hanging around. She's got a perfect face, zero sense of personal space, and a habit of treating him like a little brother — or maybe a pet. One minute she's leaning in way too close, the next she's acting like his mom. Asahi's heart can't catch a break.

This is a light-hearted seinen romcom with a gyaru female lead and an otaku male lead who keeps accidentally winning their teasing battles. The art is clean and the expressions sell every awkward silence and flustered blush. If you liked "My Dress-Up Darling" or "The Maid I Hired Recently Is Mysterious," this hits that same sweet spot of wholesome teasing and slow-burn chemistry. No heavy drama here — just a fun, easy read.

Also known as: Ane no Yuujin, The Cutest Girl Closest to Me, My Older Sister's Friend.

romcom, seinen, gyaru, otaku, age gap, slice of life, comedy, manga, slow burn, wholesome