Wakana Amane's betrayal shatters her husband's world. Finding her in lingerie she'd never normally wear sparks suspicion, which turns to devastating reality when he returns home for forgotten documents—only to catch her in the arms of another man. Witnessing her animalistic, passionate affair, he succumbs to masturbation, consumed by torment. Returning to work, he maintains composure, but the image of her infidelity haunts him. Though she treats him kindly, rage festers beneath his surface, driving him to force her into giving him oral sex. Briefly remorseful, he apologizes—but the guilt fades quickly. He can't let this go. Determined to gather undeniable proof of her affair, he resolves to install hidden cameras throughout their home...