Meeting Amane-san and his friends at a cosplay event, Marin and Wakana learn about a group cosplay photoshoot they are preparing for Coffin, a horror game. Unfortunately, the older cosplayers have commitments that prevent them from attending the studio appointment! Marin, with her always active mind, decides to call someone to see if they will join an impromptu cosplay collaboration, but it will be a tough task! When more participants are needed, will Wakana have to step up to strengthen the team?