Yuujin ni 500 Yen Kashitara Shakkin no Kata ni Imouto wo Yokoshitekita no Dakeredo, Ore wa Ittai Dou Sureba Iin Darou - Vol. 1 Ch. 1

[MangaDex]

 

[Xzayer]

Oh bro I’m broke here’s my sister as collateral.

. Let’s see how she will accomplish her goal.

 

[Kaiser92]

That just getting a roommate with extra steps
Bro got scammed lol
Hope landlord doesnt find out

 

[SonicDisgaea98]

Before even reading, here's my guess: this was the actual reason for the lending money, the dude was being a wingman for his sister, and has no intentions of paying back. Very questionable methods, though.