Yankee Musashi-san to Oyamada no Kiken na Junjou

Oyamada has the top grades in his first year class but is hopelessly in love with the second year's bad boy Musashi Kido. Ever since Musashi saved him from a group of bullies, Oyamada hasn't been able to keep Musashi's broad back out of his mind. Having entered the same high school as him, Oyamada persistently tries to become Musashi's pupil. One day, he decides to follow Musashi after school to learn his secrets... as a house-husband?!

(Source: Fantasista Inc.)