Yuki Nijino's manga / #foreigner(4)

Mafia lookin' dude from the 1920's time travels into the future and meets a salary man that he then threatens then almost rapes but not quite, they get along after some time and start having sex and profess their love for each other. The time travel part is never explained for some reason.

Overworked office worker goes into neighbor's apartment mistaking it for his while severely sleep deprived and they wake up in the same bed. Boom romance.

Ch. 5.5 end In high school, Arata fell for a British girl. A salaryman now, he's reunited with that person, but they're actually a man?!