From what has been showed of his writing. Looks very promising.

I wonder though, was he the sole writer for Pandaemonium and Palace of the Dead story and lore behind them then? If so, big props. As odd it may sound, the story and lore binded with Palace of the Dead, always felt like more, than what was given on its surface alone. the set up into House of the Dead, and Palace of the Dead was very fascinating. With the inclusion of Edda and her group's journey into utter tragedy was like a hidden gem, easily glanced over on first sight, if not expecting much from it at first. But then after clearing floor 50 and then 100, suddenly wanting to backtrack and rediscover them, is quite something. Then again I doubt Hiroi had such to do with floor 150+ in PotD but that place was always felt like something beyond time itself.

Seems like Hiroi applies an extra layer of lore in-between Character, World, and Story.

Makes one wonder where 7.0 might take place, almost sounds like it would be a lore rich potential place(s).