Classroom Crisis

Classroom Crisis is an original anime series that aired in 2015.

Set in a future where mankind has mastered interplanetary space travel, the story follows the members of the specialized A-TEC class, high school students who also happen to be company employees engineering rockets for the space aeronautics mega-corporation named Kirishina Corp. The class progresses on developing a new engine called the X-2, while getting to know Nagisa Kiryu, the new transfer student who turns out to also be their newly appointed chief as well as the younger brother of the corporation's CEO.

Episode 3
Nagisa takes a shower.

Episode 5
Kaito has fun with his students at the beach, and Nagisa visits a hot spring.

Episode 5.5
Kaito visits the hot spring.

Episode 12
Nagisa is stripped to the waist after being attacked and then kidnapped.

Episode 13
Nagisa is rescued.