The fourth installment in the doujin-style invincible series brought to you by the cosplay AV studio. This time, popular Karen Sakisaka takes the spotlight! Formerly active as an underground idol, she has now left her agency and gained freedom, leading her to appear on a late-night sensual verification show. Under special conditions, she abstained from masturbation for two months prior to filming. On the shoot day, seeing an erect penis in a porn video made her squirm in agony, feeling so aroused she could barely resist calling her lover over. Though she laments, "I shouldn't be doing this~," once she's dressed in cute black cat lingerie, she can't hold back and quickly changes into her outfit to begin filming. The video features various erotic positions designed to bring her to full satisfaction. The black cat lingerie cosplay is one of its main attractions, with the video running for 40 minutes.