Shoujo Kesshou Kokoro JikaruShoujo Kesshou Kokoro Jikaru; 少女結晶ココロジカル; Cocological Crystal Girls

Year 20XX, everyone is crazy to dance in the virtual world BOX, but at Kokoro Koyomi's house the BOX is banned. For this reason, Kokoro logins in secret, but remains trapped in the virtual world because of a mysterious virus.