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

I love my mother, Kana. The reason is that Kana-san is not her real mother, but because her father remarried and the woman she admires. After my father passed away, he raised me, who was not related by blood, to university on a single woman's basis. I wanted to repay Kana-san, and at the same time I had more feelings than my mother. However, his feelings are shattered by his best friend Kenji. While supporting the relationship between me and Kana, Kenji suddenly approached Kana, who was envious of the relationship...