First Love Monster manga volume 2 features story and art by Akira Hiyoshimaru.

"Kaho isn't a thing. You can't treat girls like objects." Although high schooler Kaho and fifth grader Kanade have started dating, Kaho is constantly at the mercy of Kanade's childish whims. And when a mysterious hottie with a Kansai accent - whom Kanade happens to call "Aniki" - arrives, will unimaginable trials await the couple's blossoming love?!