The Tokyo U Promise from 15 Years Ago: Diary (E04)

It is revealed that Keitaro is not a Tokyo University student. He humbly begs their pardon. He is forgiven on conditions to be a good caretaker and to pass the exams for Tokyo University. But he is pushed around to do cooking, laundry, and house cleaning, so there is no time to study at all. One day, he asks Naru to teach him study. (Prime Video)