I Was Stranded on a Deserted Island with a Beautiful Classmate

During the school trip heading to a remote island, they were struck by bad weather as a typhoon hit, and the ship sank. Tetsu Hayasaka, a second-year high school student, woke up lying on a sandy beach. When he looked around, he saw his classmate, the beautiful Mana Amane, collapsed next to him. It seemed they had been drifting and ended up stranded. However, the island was a deserted one. With no way to return, they had no choice but to survive on the island for the time being. Together with Mana, Tetsu begins a survival adventure, but soon more girls from his class are found, and it eventually turns into a harem. One guy and fifteen girls…Will they end up competing for him!?