Hikaru lives in her lover's house as a kept woman. One day, her lover's son suddenly shows up, drastically changing her daily life. Hikaru gets tied up and subjected to extreme perverted games, including having her nipples clamped with clothespins. Bound, tortured with nipple clamps, raped, and eventually forced into a threesome, her body is relentlessly stimulated. As the men's desires explode, she is swallowed whole by their overwhelming lust.