[Zankoku12]

Spoiler:

Aren't we all wishing Riki to have something with other heroines beside Rin in Refrain ?
But we're playing though Riki's perceptive and since he didn't remember romance with anyone,there're really no place to insert it in.

And if we take the drama CD that happen during the beach trip as canon then I don't really see any romance happened(but ofc I can't be sure and that's just how I feel).............well,maybe beside a lot of RikixKyosuke.