P.I.P.

Izawa, an ordinary junior high school teacher, meets Tao, an innocent looking girl, at a brothel in Phnom Penh, the capital of Cambodia. He gives her a large sum of money to help her sick mother before returning home. However, when Izawa visits Phnom Penh again in search of the girl, he is accused of fraud and ends up being imprisoned for a crime he didn't commit! Izawa's lonely fight for freedom is just beginning… (Source: MangaHot, translated)