My Beloved Stepsister Who Raised Me Alone, Stolen by My Worst Friend… Jinguuji Nao

Synopsis

Nao and I aren’t real siblings. She became my stepsister when my father remarried during my student days. After our parents died in an accident, my much older stepsister Nao became my guardian. Living together was lonely, but I harbored romantic feelings for her and found happiness in our bond. One day, I noticed my best friend Yuzuru talking secretly with Nao and felt jealous, but he skillfully avoided my questions. From that point on, Nao began coming home later and later…