So, as I've picked up, you need all the social links to max to get the true ending, right? So, is it possible for Jeff and Vinny to get this with the time they have left?

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You don't need to max every social link. I got the true ending and I maxed only Chie, Yukiko, Yosuke, Fox, Kanji, Nanako and Dojima.

You don't need all of the social links to be maxed. You just need to TALK to those people who's social link you've maxed out with when the time comes. At least that's part of how I got to the true ending path.

Nope, you just need to talk to all the people you maxed s links with at the appropriate time.

Oh, that's pretty cool then. Onwards to true ending.

And it's next to impossible to max all the S. Links in your first playthrough.

No need to maximize all social links to get the True Ending.If you manage to maximize all SLs,Margaret will give you an armor that give 50% more EXP perbattle.That is all.