Joe Higan is a Nukenin – a former ninja who escaped his clan and is hiding from his violent past in rural America with his family. One night, he is ambushed by a team of assassins from his former organization who exact a bloody retribution on Joe and his family for betraying their ancient code. Rising from his seeming "death," Joe will re-emerge as his former self – Ninja Kamui – to avenge his family and friends. Kamui is a 21st century ninja, a shadowy anachronism who pits his ancient skills against high-tech weaponry with brutal finesse. He must face off against trained assassins, combat cyborgs, and rival ninjas to bring down the very clan that made him.

Yoshizou Yukawa is a passionate hot springs enthusiast—a hot springs hunter who was able to sniff out the source of springs. One day, while searching for a hidden hot spring to revitalize a town, he slips off a cliff and dies. He is then reincarnated into another world by an Inari deity of a small shrine hidden in the rocks. Yoshizou is joined by Inari's messenger princess, Mayudama. The hot spring hunter within Yoshizou is stirred right away, as he takes a bath with Mayudama in the hot spring he just discovered. Then, an elf girl appears...

High school student Rakurou Hizutome has a peculiar hobby of playing poorly made games—ones that are unbalanced or are filled with so many bugs that make them borderline unplayable. The few who share his hobby might recognize him by his in-game name, Sunraku. For his next game, Rakurou is recommended Shangri-La Frontier, a popular and well-received virtual reality game as a breather from the terrible games he has been playing recently. Once he boots up the game, Rakurou decides to sell off most of his starting gear to gain extra money, leaving himself with only a pair of boxers, a bird mask, and some weapons. He is instantly hooked as he meticulously levels up his avatar. However, after encountering some intimidating monsters, he realizes that he may have underestimated the challenge that a mainstream game can offer. As Rakurou progresses, he must draw on all the skills he has perfected from his previous gaming experience. Before long, Sunraku's eccentric playstyle takes Shangri-La Frontier by storm.

Side stories of , based on a series of shorts that were posted on X (formerly Twitter).