Yabe is an acquaintance of Yumi Ishida from their student days, where they participated in group sexual activities recorded on video. He later runs a porn production company. When Yumi accumulates significant debt from guaranteeing a friend's loan, Yabe approaches her with an offer to work as an actress. This proposition creates conflict for Yumi between her marital loyalty and financial desperation, though her remorse lessens as she continues working for him. Yabe directly influences Yumi's self-perception by asserting her involvement in the adult films reveals her true nature, previously suppressed after marriage. His observation fuels Yumi's internal conflict about her identity and past promiscuity.