Endless World 

Ikki, an optimist who isn't afraid of anything, begins working at a small restaurant when he finds himself charmed by the owner. It's there that he runs into Ryuu, and from Ryuu, he hears Toshimitsu's name, one that's oddly familiar. Neither Ikki nor Ryuu can seem to get away from Toshimitsu, and now their mysterious shared past will lead to an unknown future.