Persona is a series defined by its calendar system. Everything revolves around it: the school schedule, dungeon deadlines, and social events. So what happens when you try and stuff that core gameplay system-shaped peg into a gacha-shaped hole?..
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Persona 5: The Phantom X had a hard time doing away with the series' iconic calendar system: 'It was very difficult to convince the team'
Source: PC Gamer (opens in a new tab)