asche's manga / #Magic(5)

Man goes back in time after surviving the end of the world. He is determined to train his old comrades so everyone can survive together!

A heroes party made up of masculine women, feminine men, and a hermaphrodite! The party's mage wants to be popular like their leader, but he doesn't realize he's already earned the leader's affection. While they've already saved the world, it seems like there's a new plot to turn summoned heroes into villains.

MC used to be a royal lapdog but was beheaded as part of the emperor's schemes. She goes back in time and decides to live life according to her own wishes instead of as a "proper knight."

FL reincarnates into villainess who is replaced by the true Saint, but it turns out both are Saints so the original bad ending doesn't come to pass. ML is a yandere and a bit stupid but still better than other leads out there.

Pretty much what the title says; MC is a Mary Sue but somehow the plot stays interesting.