A masochistic cosplayer dressed as a character from a bullet hell STG is taken to a hot spring for a photo shoot, where she is tied up and trained to orgasm! CHIGUSA is a congenital masochist introduced in the previous work, AYASE. Her 90cm F-cup breasts are just as rewarding to tie up as AYASE. After seeing AYASE's photos, she volunteered to be tied up and have beautiful artistic photos taken, so as per her character's description, she put her body on the line to be trained in bondage and creampie sex.