BF-727 I can't believe my fiancée turned out to be the sex friend of a rich old man... Emi Nishino

Sinopsis

I have a girlfriend who is engaged to me. But I accidentally saw her entering a love hotel with a strange old man. What on earth could have happened?! She told me she loved me so much... I have to ask her the truth. But I'm afraid of being dumped, so I can't ask her about it...