Mama x Kano ~Oshiego no Okaa-san ga Ecchi na Sensei de, Musume no Sewa o Yaitara Dame Desu / ママxカノ～教え子のお母さんがエッチな先生で、娘の世話を焼いたら駄目ですか？～

The protagonist seeks to become a teacher, just like his first love Sawako.

Failing to find a job as a teacher at one of his schools, he continues to study part-time as an instructor at a private school.
One day he heard about the recruitment of teachers from his home school and decided to take teaching seriously in order to fulfill his wish.

When he arrived, he learned that Sawako had already stepped down from teaching after leaving school.
To his surprise, he discovers Sawako's daughter, Yuna.

And for some trouble when he moved to town, he had nowhere to live.
One day, when Sawako meets her and talks to her, she finds out about his problem and offers to stay with her.

So begins the life together of the teacher, mother and daughter, as well as their strange love relations.