Meitou "Isekai no Yu" Kaitakuki: Around 40 Onsen Mania no Tensei Saki wa, Nonbiri Onsen Tengoku deshita

During an expedition to discover a new hot spring, middle-aged Kouzou Yukawa finds himself falling from a great height. Luckily, that is not the end of him, as a goddess transports him into another world and assigns her assistant Mayudama to guide him! Wasting no time, Kouzou immediately begins to bathe in a hot spring and convinces Mayudama to join him. As more people begin to show up at the place, Kouzou hopes to share its greatness with everyone. [Written by MAL Rewrite]