Hatsukoi Monster

or Hatsukoi Monster is a manga series written by Akira Hiyoshimaru and published in Kodansha's Aria magazine. An anime television adaptation aired from July to September 2016.

Plot
The story follows 15-year-old Kaho Nikaidō as she leaves home to live in a high school dormitory. Almost getting hit by a truck, she is saved by a boy named Kanade Takahashi. She falls in love with him, only to discover that he is her landlord's son and a fifth grader.