Kon'yaku Hajimemashita

Main character studies and earns his living at part-time jobs due to opposition to over-protection of parents. One day parents insist on marriage in a telephone talk. Protagonist wants to choose his bride himself. His employer encourages him to choose among the two daughters. One of the sisters is protagonist's teacher, and the other one is a classmate. Where will it take him?

[From vndbreview]