According to the JP wiki, there are a few regen items. Ignoring events and trades, I think the first farmable one is the one from 3-4 which recovers 4% each turn.
Item google translates to Inflow (花入)
https://mononohu.gamerch.com/%E8%A3%...A3%BE%E5%93%81



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the ones I'm using for exemple. One gives DEF and the other gives ATK. But all of the base stats says that it gives HP which is a lie.