An adventure title combining science fiction and love simulation elements, you are Takure, a member of a group attempting to defeat the Izekijin. The Izekijin are a group of mysterious creatures who are waging war on humanity. Equipping your special Marusu defensive suit, you protect civilians from Izekijin attack. On top of the science fiction story, Hametsu no Marusu features love simulation elements which involve the player establishing relationships with a number of heroines. These girls are a part of AAST, a special group that plans strategies against the Izekijin. Outside of battles, the game plays like a conversation-based love simulation, with animated movies used to advance the storyline. A limited edition version of the game includes a drama CD, 3 post cards and an art collection (9240 yen).