Yoko Kujo is lured in by the promise of a reward for completing a naughty game. She must keep talking naturally to her boyfriend on the phone while unseen hands tease her; if she hangs up or he ends the call, she receives a punishment instead. She survives relentless tickling, but the challenge escalates to breast teasing and her lusty moans threaten to expose everything. With even harsher tasks still coming, she must keep enduring—or else...