did she lost her memory? if she did, then she lost the two years of her memory. but her ears used to be pierced... so it's like she's coming back to the past where she hasn't met kudou yet? but that also doesn't make sense cause she remembers kudou, but she doesn't remember them being in a...
@gregger i think both of them know. i remember nao was feeling down cause he didn't know kou-kun was a girl then both nifuji and narumi helped nao to get kou-kun to talk to him again.