Bancho Planet

(from ebookjapan):

Ryu Todoroki has never lost a fight. However, he was outnumbered and forced into hiding. He tried to hide in a hole in a large Inari tree, but the hole was unexpectedly deep. Ryu rushed to crawl up, but something was wrong outside.

It was daytime when he fell in, but when he crawled back up, it was nighttime. Ryu, feeling a sense of discomfort, decided to go home. However, on the way there, he witnesses a police officer shoot a drunk to death...!?

The Final part of the Ryu Trilogy.