Ichika Tatewaki, born Ichika Itsuki, presents herself as the quintessential wife: demure, strikingly beautiful, proficient in domestic tasks like cooking, and meticulously attentive to her husband Masato's marital expectations. This cultivated façade conceals an extensive double life defined by covert public exhibitionism and illicit sexual pursuits, driven by unresolved trauma from her past.

During her school years, Ichika endured a formative violation when she lost her virginity to an individual named Yamazaki. A second man, Sasaki, intervened not to aid her but to perpetrate further assault. The entire incident was captured on video, fundamentally shaping her subsequent secret behaviors.

Her pivotal development occurs when she deliberately sends Masato a DVD documenting this school trauma, abandoning concealment to expose the origins of her double life and risky sexual activities—previously unknown to him. Masato's response to viewing the footage manifests as arousal rather than anger or horror.