Ruma is the most beautiful and popular girl at school. She acts nice and polite with her classmates and friends, but she has a side that almost every male student knows: she has the perfect sex body and likes to have sex with any student she wants, where she wants, and when she wants. Actually, she only feeds on the sperm from her sexual encounters. The couples from Stringendo & Accelerando also appear in these OVAs and are Stretta's photo-targets so she can masturbate later with their sexual encounters.