The unresolved conflict of a warrior and a demon king dates back 2000 years. Alas, in the ultimate showdown, the demon king emerged as victorious. Today, their legacy lives on through their direct descendants who have unparalleled transformation abilities. Children from ages 12 to 18 possess unique powers to transform into different beasts, like slimes and golems. Among the "monster kids" are Imaichi Butsuko and Hinase Suiren. As they live their normal school lives, the looming return of the warrior serves as a constant reminder to prepare for an inevitable battle.
