给下一个牺牲者的死亡通告 -与君共渡这片无边无尽的黑暗-

When a bizarre chain mail about a serial killer becomes popular on the Internet, no one suspects that the murders are actually happening. This is the story of the people caught in this bizarre game.

(from JBox)

An adventure-mystery themed visual novel by Boost On and illustrated by Goto-P.