14-sai no Joshachou, NEET wo Hirou

Takasaki Hanashiro is a junior high girl who is also a busy entrepreneur. She is a rational thinker with a super science brain. When she finds a dirty man...... slumped over in a garbage dump, she ends up taking him in. But the young man turns out to be ridiculously handsome, and he wants to live with her as a housekeeper...?

(Source: Kurofune Pixiv, translated)

Note: Chapter count includes one bonus chapter.