"CLAMP-NET and CLAMP's Twitter status updates have recently confirmed after an unplanned extended hiatus that the series has gone on hiatus indefinitely as of volume 4 and will been taken off the official site's "ongoing serializations" list (tankouban release ends at chapter 20--serialized release ends at chapter 22). The reason behind the indefinite hiatus is unknown, as is whether or not it will be returning in the near future."
From Gate7 wikipedia:
"CLAMP-NET and CLAMP's Twitter status updates have recently confirmed after an unplanned extended hiatus that the series has gone on hiatus indefinitely as of volume 4 and will been taken off the official site's "ongoing serializations" list (tankouban release ends at chapter 20--serialized release ends at chapter 22). The reason behind the indefinite hiatus is unknown, as is whether or not it will be returning in the near future."
:'(