The light novel Isekai Onsen ni Tensei Shita Ore no Kounou ga Tondemosugiru (I was reincarnated as an onsen in another world, and I’m way too effective) by Sou Nanaumi (story) and Airi Mori (illustration) started serializing a manga adaptation in Kadokawa’s ComicWalker on 21 June 2017.
The basic story is about Atami Kusatsu, a young boy who dies in a bus accident on his way to an onsen (hot spring). When he wakes up, he realizes he has become an onsen! Women come to bathe in him, but the water sometimes does strange things, according to Atami’s will or emotions, like become hard or milky-white or rise in temperature.The more people come to soak in him, the higher his level gets. In the first chapter, he thinks about what he can do as an onsen to rescue a young girl on the run from goblins.
(c)Airi Mori 2017, Sou Nanaumi 2017