First Love Monster, Vol. 2 — 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?!
A fast-paced super-love comedy filled with madcap heart-throbbing mayhem!