From Renta!:

At a friend's request, Midori agrees to see a male college student, Sosuke, for relationship counseling. Normally she only accepts female clients, but worried for Sosuke, she agrees to be his girlfriend for a day and offer dating pointers. Sosuke's clumsiness and kindness strike a chord, and before she knows it, the two are standing in front of a hotel. He asks for more private help with his relationship. Is he serious!? Midori's bad habits kick in, and she finds herself following him inside...