on the first day (初日に): On the first day of school, I made new friends. (学校の初日に新しい友達を作りました) - 試験に出る! 英単語検索辞書

on the first day (初日に): On the first day of school, I made new friends. (学校の初日に新しい友達を作りました)

On the first day of school, I made new friends.