Hinako, a friend of Asahi's older sister, is a frequent guest at the home of the high school boy. She always misleads his mind with her suggestive attitude while treating him like a little brother... or rather, pet? ___ **Note:** Chapters 1 & 2 can be found in the [pre-serialization](https://mangadex.org/title/abad18cf-bf72-4bbc-97c8-b55dfa28f9b9/ane-no-yuujin).