Cheating Craft

Cheating Craft is a Japanese/Chinese anime series that aired in 2016.

Based on a Chinese novel named Zuobi Yishu, the story is set in a world where academic success determines one's entire future. There are two strategies for making it through exams, with the students who dedicate themselves to studying being called “Learning Type” students, and those who pass by cheating being called "Cheating Type" students. Cheating Type student Mumei teams up with Learning Type student Kouin to battle their rivals for the top grades.

Episode 5
The latest test is held with a sudden pool day.

Episode 8
Mumei wears a towel in the sauna.

Episode 12
Mumei uses a secret technique which rips off all of his clothes.