What if Jesus and Buddha were living on Earth in modern times? What if they shared an apartment in Japan? Saint Young Men is a humorous manga about the daily lives of Jesus and Buddha, with each chapter focusing on some element of modern life, such as Disneyland, rush hour on the train, Christmas, the public pool, carnivals, and more.

Gag manga about a young "elite" man who has a policy of not being in debt to anyone. But he ends up owing his life to a strange girl who saves his life. Nino, the girl, believes she's a martian & lives under the bridge by the Arakawa river. So the young man ends up living there too.
(Source: Manga Junkie)