Danshi Koukousei wo Yashinaitai Oneesan no Hanashi

Minoru Soramoto's parents have vanished into thin air, leaving him with a large amount of debt he is unable to pay off. Just as things start to look grim, his neighbor decides to help him out by covering the debt in its entirety, in exchange for "keeping" him. Now, Minoru has moved in with her and begins a life of freeloading with a beautiful lady whose entire existence revolves around him and making sure that he has everything he wants and needs.

[Written by MAL Rewrite]