Ten years ago, a young Jinta promised to marry a certain girl. And now that he's all grown up, a wacky oni girl shows up at his door! Originally published in Weekly Shounen Jump 2021 No. 23. Compiled in Volume 4 of [its serialization](https://mangadex.org/title/dd892b67-f597-4362-b390-4467a78c1bd9).