My beloved stepmother who raised me alone was taken away by my worst friend...

I like my mother, Marina. This is because Marina is not her real mother, but the woman she admires when her father remarried and became a new mother. Since my father passed away, women have raised me on their own. I wanted to repay Marina, and at the same time I had more feelings than my mother. However, his dream is taken away by his best friend Yuzuru. While saying that she is supporting Marina's relationship with me, Yuzuru becomes envious of her relationship, and suddenly approaches Marina...