It's a normal and especially hot summer day, Tsukasa along with his group of friends namely: Emu, Nene and Rui decided to spend some time on the beach and relax...after a while Emu decides to play a game together with everyone...whoever finds the most shells wins! Tsukasa at first didn't want to participate in this game...but then he was convinced and so they all started looking for shells going around....Tsukasa, trying to find the shells went away a bit ending up in a small cave with a small hole where there is sea water, Tsukasa continued to search, but at a certain point he feels observed...he turns his head and sees someone looking at him in the small hole of water

“W—who’s there?!” Tsukasa said