Same to Ikiru Nanokakan

One night, Fukami Kyouhei suddenly found himself lying on an unfamiliar beach. Looking around, all he saw were the vast ocean and sandy beach...... Drowning in confusion, other than that, he also felt something strange on his head and when he fearfully checked it out—— "Agu, Agu" A naked girl with a shark-like appearance was biting Kyouhei