In this spinoff series, Rimuru gets his hands on a notebook and decides to compose a record of his many adventures. But where to begin?

The story revolves around Haruka Nanase, a boy who has always loved to be immersed in water, and to swim in it. Before graduating from elementary school, he participated in a swimming tournament along with his fellow swimming club members, Makoto Tachibana, Nagisa Hazuki, and Rin Matsuoka. After achieving victory, each of the boys went their separate ways. Time passed, and in the middle of their uneventful high school lives Rin appears and challenges Haruka to a match, showing Haruka his overwhelming power. Not wanting it to end like this, Haruka, gathers together Makoto and Nagisa once again and brings a new member named Rei Ryugazaki to create the Iwatobi High School Swimming Club in order to defeat Rin.

Girl-crazy Tomoki’s quiet life gets turned upside down when beautiful, winged Ikaros falls from the sky – and starts calling him master! She seems a little bit lost on Earth, and her origins are shrouded in mystery. One thing’s for sure, though – she just might have the power to make Tomoki’s every dream come true! The heavenly hijinks continue in Heaven’s Lost Property: Forte! Tomoki may long for peace and quiet, but with Ikaros and Nymph still adjusting to life on Earth, things aren’t likely to calm down anytime soon. Plus, there’s a new Angeloid on the scene – and she’s been sent to eliminate Tomoki! And check out the hilarious, super-sexy Heaven’s Lost Property movie, The Angeloid of Clockwork! Hiyori’s a sweet, shy girl infatuated with Tomoki. To get closer to the dirty-minded object of her affection, she joins the New World Discovery Club and starts bonding with Ikaros, Nymph, and the gang – until a sudden, tragic accident changes everything. Why is she trying to kill Tomoki, even after confessing her feelings?

When Tsukune accidentally enrolls in a school for monsters disguised as humans, he must hide the fact that he's really human or risk losing his life.

A half human, half Yoma monster sets out to attain justice against the evil full-breed Yomas, hideous fiends who feed ruthlessly on humanity.