Talk:Zarestia/Relationships/@comment-45473788-20200413102923/@comment-8703003-20201015230633

It's an alternate timeline story during Arc 3 where Rem agreed to run away with Subaru instead of gently encouraging him to not give up on saving Emilia. They ended up running away to Kararage (where Anastasia is from) and shortly after got married - which is why in this alternate timeline she's Natsuki Rem.