In what year was the album “iv” released by SawanoHiroyuki[nZk]?

In what year was the album “iv” released by SawanoHiroyuki[nZk]?: The album “iv” was released in 2021 by SawanoHiroyuki[nZk], featuring 16 tracks.
What is the most successful song from the album “iv” by SawanoHiroyuki[nZk]?: “Nexus” is the biggest hit from the album “iv” by SawanoHiroyuki[nZk].

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