As "That's Cunning! Shijo Saidai no Sakusen", "Bad Genius" is a film about cheating in exams to achieve a goal.
In the first one, the goal is to protect their dorm. In "Bad Genius" the goal is to complete the task in order to receive money.

Both of them are about people cheating in exams, Although they don't have the same motivation or objective to cheat.

Both plots are about insecure women that rent a boyfriend.
Although i think *Boy for Rent* is more "real life" than *Kareshi wo Loan de Kaimashita*