Tokyo: I took in a homeless girl

After being reborn in Tokyo, Sawayama Haruno also lived a relatively happy life.
With unremitting efforts, he successfully entered one of the top universities in Asia. With the experience accumulated in his previous life, he began to prepare for his future path as a literary giant.
Because of this, looking at his belated system, Sawayama Haruno just felt like laughing.
I have been working hard to become a plagiarist, so it would be better if the system didn't come now.
But the next second, the characters that appeared in the system made him unable to laugh.
——That was his ex-boyfriend’s twin sister, the girl who almost became his sister-in-law, and she was facing the crisis of becoming homeless.
Unfortunately, Sawayama Haruno learned the girl's fate. Fortunately, he was only separated from her by a wall, and his wallet was still full of Fukuzawa Yukichi...