tate no yuusha no nariagari manga

My best friend takes me to a beauty salon for a facial. A young and handsome employee there latches onto me. He's tall, good-looking, and is great with women. He knows just the right things to say and is flirtatious without being lecherous. He shows me the pleasures of being a woman… I forget all about my boyfriend and allow him to make me descend into the throes of passion. What I don't know is that there's a price I can't pay behind the gentleness…