It might be that I played Innocent Sin and not Eternal Punishment all those years ago. Hard to remember after 15 years, and it doesn’t really matter.
The plot of both Innocent Sin revolves around rumors coming true. A topic Persona 4 will go back to with the Midnight Channel. “If you dial your own number, a Joker will appear”. Only the Joker that indeed appears to Tatsuya attempts to exact revenge on him. Frustrated that Tatsuya has no idea revenge for what, Joker disappears.
It’s interesting how battle system has devolved in later games. In Persona 2, there are attacks that are both physical and elemental. Also, Water and Earth elements were removed from later games. And some spells instead of targeting all enemies, only target enemies of the same kind.
The dialogue system is a bit wonky. The way it works is that you can speak to your team members in any order, but sometimes their reply will be to something someone else says later on.
Being an RPG from PSX era, you really need to read into what people tell you if you’re playing without a guide. There are no quest markers there.
As I mentioned, I’m not a big fan of the dialogue system in Persona games. Each character has 4 lines, that work differently for different personas. Yukki has “reason” line, so she can make “wise” persona “eager” to give you cards, with which you purchase more personas. “Foolish” persona reacts the same to Tatauya’s “Dead stare”. If it was only matter of memory, though. Personas can ask you nonsensical questions, like “is school fun?”, and the answer should also depend on the persona type. That’s where I draw the line. Luckily, the old good grind still works