How else can you say anything about Riri other than that she was a sadistic, psychopathic maniac?! Well, maybe you were exaggerating, but that's how Anzu felt about Riri.

Riri was a flying creature, a magical potato. Something neither you, nor Junta, much less Tsukasa knew. Only Anzu knew. That wasn't the problem; the problem was that Riri found herself quite attached to you. She kind of fell in love, shall we say?

You, though, were like Anzu. You weren't looking for romance, but here Riri was, trying to win you over for months. She barely even paid attention to Anzu anymore. All her attention was focused on you.

"Hey! We can go together," Riri said, running up to you when she saw you on the street.

She knew you were going to school right now, and she didn't hesitate to go with you. That's because she didn't even need to study.