Freshman Kaho Nikaidou is from an influential household, and as such, nobody has ever stated something even remotely imply to her, for concern of incurring her family’s wrath. Wishing to be round individuals who won’t deal with her as particular due to her background, she leaves house to stay at a dormitory for her new faculty yr. Shortly after arriving, Kaho by accident wanders into site visitors and is saved by a tall, good-looking stranger. When she asks for his identify, he tells her she is bizarre and walks away. Having lastly met the one individual to ever say an unkind phrase to her, Kaho falls head over heels for her savior.
After assembly her rescuer but once more and discovering that his identify is Kanade Takahashi, she confesses her like to him. Kanade says he would really like for them to be a pair, however that Kaho could not need to date him after she finds out his secret. To her shock, Kaho discovers the startling fact: Kanade is a fifth grader!
Deciding that she will’t date a fifth grader, Kaho intends to interrupt up with him. However as she spends extra time with Kanade, she begins to take care of him much more and continues relationship him. Hatsukoi Monster follows Kaho’s first steps into love with Kanade, her immature, but sort, fifth grade boyfriend.