Tennis no Ouji-sama: A Day of the Survival Mountain - Kyoufu no Kyouka Training!

A group of high school tennis players takes a break from their usual schedule to go hiking on a mountain with a tennis resort at the summit. Upon arrival, they discover that the resort's courts have been occupied by a team of college players. Anticipating a training session, the high schoolers instead find themselves facing off against the newcomers. One of them, in particular, is eager to demonstrate the proper way to play tennis.