Akira Hiyoshimaru is the creator behind the manga series First Love Monster.
Though Kaho and Kanade break up due to Kanade's own immaturity, the fifth grader soon realizes just how precious Kaho is to him. Which leads to the completely mature actions of chasing her home, serenading her with piano-accompanied love songs, and even making an emergency marriage proposal?! Surely the age gap between the two means marriage is impossible--but Kaho and Kanade tentatively exchange vows! Meanwhile, it seems like a new threat is waiting to test the young couple's relationship--and that busty high school girl and devilish college student are at the center of it!
Snooping into Kanade's diary has yielded more questions than answers for Kaho. She is no closer to learning the nature of her fifth-grade boyfriend's feelings for her, but she has discovered a rather passionate entry about another girl! Just who is "Sadako"?!! The uncertainty only adds to her anxiety, which has been steadily building since Taga's stolen kiss. As obstacles (and a crazy supporting cast) compound, will Kaho and Kanade be able to sustain their first love?
Kaho tells Kanade about her kiss with Atsushi. Any normal boyfriend would get mad, but Kanade only smiles back! Amid these complicated feelings, she ends up alone with Atsushi. Is this the start of a love triangle?
Kanade works hard to make the perfect birthday present for Kaho, but when he tries to deliver it, he catches her kissing Taga in the rain! Heartbroken, Kanade runs away, leaving everyone back at Kasumi Residency desperate to bring him home...but Kaho doesn't know how to face him anymore! Will their fragile romance weather this storm?