reika's manga / #Isekai(615)

Sei and another girl is teleported into another world with the hopes of one of them being the Sacred Maiden/Priestess and was immediately ignored by the Crown Prince (AKA Idiot) who instead greeted the cuter girl and left the room. Sei makes a name for herself using her own strength and just so happens to be the Maiden this world is looking for but she keeps it a secret bc she still kinda holds a grudge for the people in the palaces' behavior towards her (the ignoring that is).

The Hero (who's the MC) defeats the Demon King and was immediately betrayed by his subordinates. A goddess who has fallen in love with him revives him and he seeks revenge for everyone who killed him.