Kokan Musou ~Kiraware Yuusha wa Mazoku ni Aisareru~ summary:
Kantarou, who has ascended to heaven because he is too sick, reincarnates in a different world. Kantarou, who is distorted in character and is a fatty, is disliked even after reincarnating, but notices that a cloudy potion that cures anything from his crotch appears. Moreover, it also has the effect of powering up the demons, and it will be loved by the demons ...!? A different world reincarnation fantasy that is unmatched in the crotch !!! (Google Translate)