Bokutachi wa Benkyou ga Dekinai S01E03 - A Genius Resonates Emotionally with X

The results of Nariyuki's tutoring are about to be put to the test with the midterm exams. If the girls don't raise their grades, they'll get a new tutor. The three of them want to keep Nariyuki, though, so they become even more resolved to study hard for the exams.