How to Train Your Devil manga volume 2 features story and art by Tonchi Kataoka.

The (one-year-old) Devil King Grull sets out on the path to rehabilitation by helping a million people, under the reluctant eye of his new mother Zeno. Everything seems to be going well. Grull is racking up good deeds while Zeno keeps her grandmother’s adventurers-for-hire business afloat, when Grull is kidnapped by Ruby, his fanatically adoring—and perverted—demonic nursemaid! Can Zeno rescue Grull before the separation literally kills him?