Senzai Moratta dake de Tonari ni Sumu Bijin wo Suki ni natteshimatta wake da ga. Mitari-kun & Sakurai-san

A bottle of detergent. That was the beginning for me and her. I am Takashi Mitarai, 27 years old. An ordinary salaryman, except I have no memories from my childhood. One day my neighbor, Chinatsu Sakurai, shared some detergent with me and I and fell in love with her. However, there is a secret about their past where Takashi lost—