転生ベン器はツミじゃない!!•Tensei Benki wa Tsumi ja Nai!!

The Tale of the Holy Knight and the "Vessel"

The tale of a protagonist who has been reincarnated into another world as a toilet bowl. It seems that if someone pees in him even once, he will remain that way forever. Can he escape the girls who try to sit on him, and somehow safely return to being a human...!? (Source: Tokuma Shoten, translated)