※前回からのつづきのお話です。

Continued from last time.
Mika calls the teacher by his old nickname.
Mika-chan, who is in love with the teacher, apparently wanted to call the teacher by her own special, exclusive name.

※ Continued from the story before.

English:

Continued from last time.
Mika calls the teacher by his old nickname.
Mika-chan, who is in love with the teacher, apparently wanted to call the teacher by her own special, exclusive name.