I want to know, whats the real ending? MC doesnt have a good ending where He stayed in the school?
I don't classify any ending as "good" or "bad". However there is a special ending where the MC stays in the world. The conditions to reach this ending are:
SPOILERS below
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. . . . . . . . . . . . . . . . . . Romance Max only, have low world deviation, paragon dominant, then choose to stay during the ending