小恶魔的诱惑！

The protagonist, Otonashi Sumiya, and the heroine, Suzumori Mei, have known each other since childhood. Their houses are next to each other, and they have grown up together as if they were brother and sister.

But their relationship changes drastically when Mei confesses her feelings for Sumiya.

"Erotic temptation".

She began to make sexual advances toward him at every opportunity.

"I'll make you fall in love with me for sure!"

Sumiya thought that as childhood friends, they would always be like siblings. However, his feelings gradually change under Mei's daily appeals to him.

"As her childhood friend, I thought I knew everything about her."