Ame no Hi mo Kamisama to Sumou wo

I have a favor to ask. Can you teach me how to wrestle? God said so. I had spent my entire childhood immersed in sumo. What do you know, it turns out to be a village where the god of frogs who loves sumo is worshipped! When I meet Manatsu, the daughter of the family that governs the village, and a talking frog, I am impressed by her wisdom and knowledge and decide to help her in a sumo match with an alien species of frog. At the same time, a dead body is discovered in a neighboring village, and the tangled case takes an unexpected turn!

(Source: CDJapan)