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

Reiko is not a real mother. Reiko was the one who remarried when she was a student and became her new mother. After my father passed away shortly after we got married, he raised me like a real mother, not a blood-related person. As I live with Reiko every day, I was in love with him as well as in love. I wanted to make Reiko happy on behalf of my father...but she was ruined by her best friend Takumi. He pretended not to be interested, approached him, and while I was away, he reached out to Reiko for his unfaithful help...