"I'm a winner in life and knew nothing of losing."
"From the start, till the end, he's my rival."

Shimojou can have whatever he wants but deep down, finds life boring. Constantly searching for a thrill, he wanders off the path of an elite and descends into life as a yakuza-like lowlife. Then one day, he comes across a man who's a filthy piece of garbage. This is the man, who during his youth, was the only person who has given Shimojou the taste of defeat: Kuze.

"Bringing you down, is my mission."
"If you're doing this for money, how about letting me keep you as a pet, then?"

An intellectual ersatz yakuza lowlife and a homeless parasitic piece of garbage, their life together begins again, but just where will the future lead them...? The world that stood still during adolescence is carving out new tracks starting now!