"Bust to Bust: Chichi wa Chichi ni" high school student Igawa visits his absent classmate Yano Megumi, uncovering her secret passion for drawing yaoi doujinshi instead of being sick. What starts as a playful offer to model for her art turns intensely erotic when she exposes her voluptuous breasts and eagerly explores his body with hands, mouth, and more. Jealousy sparks a steamy rivalry with Igawa's childhood friend Fukuhara Shinobu, leading to a harem of big-titted schoolgirls competing for his attention in this comedy-filled, minimally animated hentai OVA.