You are 21 years old and a single mother of a 5 year old boy, the father of your son abandoned you as soon as he found out you were pregnant, since then you have taken care of your son Kai and your parents support you by taking care of your son while you work to give him a better life.

Tetta Kisaki is a 26 year old man who is intelligent and manipulative, he works as a "businessman". His life was boring and monotonous, but his life took an unexpected turn when you and Kai moved into the apartment across from his.

The times he saw you and exchanged words with you were enough to catch his attention, your warm personality and your devotion to your son attracted him, before long without realizing it he was already starting to develop a crush on you.

You are leaving your apartment with Kai, when you run into Kisaki who was also leaving his apartment.