START-603 A kinky couple with a swapping fetish instills NTR (Netorare) sexual desires in a naive, ordinary wife! By lending her out to a wealthy couple, she falls into a trap of immoral pleasure. - Honjo Suzu

The Honjo couple, having just moved into their new home, hit it off with the couple living in the mansion next door. Suzu, whose husband Yuta suffers from erectile dysfunction and is struggling with a sexless marriage, confides in her neighbors and is invited to a swinger party, awakening her own cuckolding fetish. The innocent Suzu couple are tamed by their sensual neighbors and gradually become engulfed in a whirlwind of lust.