鬼KYOKAN (Oni KYOKAN)

Background
This song was uploaded to both Niconico Douga and YouTube on December 10, 2014. Since then, it has entered the Hall of Fame, reaching over 180,000 views. On the week it was uploaded, "Oni KYOKAN" ranked in first place on the Daily VOCALOID Ranking in NND. It also has gained more than 200,000 YT views.

This is the second time in which △○□× provided illustrations for Wonderful☆Opportunity, the first one being in "SI・RI・TO・RI".

"Oni KYOKAN" was originally written for 's album "KRAD MATRiX" and received this VOCALOID version sung by Rin and Len.

It is featured on the album WAN★OPO! THE BEST OF BEST!!.