Don't Mess With The Yakuza! ~ Broken In By A Crime Syndicate Deputy Leader summary:
College student Saki meets his new neighbor on the way to his part-time job. Oboro, who is self-confessed unemployed, appears friendly and sociable but has a mysterious air about him. The two become close until one day Saki finds Oboro almost passed out in front of his apartment! As Oboro refuses an ambulance, Saki takes him in and looks after him, only to learn Oboro's true colors...+