Tennis no Ouji-sama: DokiDoki Survival - Umibe no Secret is an Adventure game, developed by WinkySoft and published by Konami, which was released in Japan in 2007.

The main character of Umibe is are Tsujimoto Ayaka. In a holiday, she joined her best friend Kohinata Tsugumi in the ship her father captained. Inside the ship are also various schools' tennis teams who are going to the place where they are going to train.

In the way, there is a typhoon and during the ruckus of leaving the ship, Ayaka is saved by Saeki and Kurobane. She loses conciousness afterwards, and awake to Atobe and Tsugumi’s worried face.

Apparently, everyone ended up in an unhibited island. However, Tsugumi’s father and the coaches’ whereabouts are unknown. After discussing, the tennis team decided to divide themselves in two groups: one would focus on the mountain area and the other on beach. Ayaka joined the beach team while Tsugumi joined the mountain one.

The gameplay is centered on having Ayaka follow the boys the player wants to focus on and pick the right answer when asked. Ayaka's daily activities there are helping the boys in their various survival chores and some mini-game through it.