Manga Kichikujima / Freak Island

The members of the Ruins Research Society from M University take the opportunity to explore the deserted island, Kichikujima -- at least, it was supposed to be deserted.

When they discover someone on the shore, an upperclassman jumps ship to investigate -- and is immediately murdered by a huge man in a suit and pig’s mask. When their ship starts to sink, the club members have no choice but to try and survive on the haunting island with its deranged serial killer!