Volume is published onto Volume 5. Here is the Synopsis of the volume:

  At death's door, Keith wakes up to find out the person who attacked him was none other than another great spirit! And Diana knows her as well! Shocked and reeling from this revelation, Keith is further surprised when Cadmus revealed,

  "Keith, someone wants to join your island."

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  Confused, Keith responds with a simple "Eh?" But when the student enters the room, he is taken aback.

  "You're the one who wants to join?!" Keith never would have expected this turn of events. However, as his group welcomed the newcomer, a sense of unease settled over them.

  In the still of the cold night,

  A chess piece was moved on the table, foreshadowing a dangerous game that Keith and his group are about to be pulled into.

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