GACKT Official Weibo update. Traduzione a seguire:

The release of GACKT’s new single “FLYING Saitama -Flying Saitama-“, originally set to release yesterday, April 1st, has been postponed indefinitely due to various complaints, including keen likeness to Hanawa’s ”Saitama Song” and repeated MV.
Thank you for listening. 

Sincere apologize to everyone it may concern. 
Sowwy. 

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Fonte: GACKT WEIBO