Sixth grade. The rather timid boy Junki winds up changing schools and hasn't quite found his place. The search for his missing cat leads him straight to Eto, a deliquent boy in his class. Eto himself is some...

Mitsui Tooru works for a large company, but all he really wants to do is spend his days relaxing at hot springs. So when his boss tells him to do some real work for once and pull in a certain customer, howe...

Original Web Manga

In a certain star system, there is a small planet called the Onsen Planet. The entire surface is covered in hot springs, and the ones who manage them are the four Santa Monica siblings.

The story follows Hakone, a hot spring spirit who descended to a spa resort on Earth. However, with her long slumber, she looks like a little girl on the outside. ("Yōsei" in the title is a wordplay on the ...