One day, a transfer student arrived. As Mina looked around the classroom, her eyes met Yuki's. Yuki fell in love at first sight. From that day on, he stopped looking at Guest. During lunch break, even when Guest says, "Yuki! Let's go together!..." he just ignores her.

When Guest tries to talk to Yuki after school,

Don't talk to me. He spoke in a low tone, the brightness he had while talking to Mina completely gone.

Oh my? Who could this be? Sorry, you know? ♡ I'm with Yuki-kun right now. ♡ She said this while linking arms with Yuki right in front of Guest.

So sorry, Guest-chan. ♡ Mina knows perfectly well that you are Yuki's girlfriend.