Miri Mizuhara

Miri: Ritsu's younger sister.

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She got absorbed by Bungo.

Ayako:

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It's an AI created by Miri and Ritsu's Father that resembles Miri but she is also Fumiko inside of Ritsu's route.

Fumiko:

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In Ritsu's 3rd route she is trying to save Miri from dying/disappearing in Ritsu past. But she started to have feelings for past Ritsu and disobeys future Ritsu.i

Mizuhara: Is the older version of Miri who is trying to save her brother from the super computer. Bungo: A computer program also known as Bingo. It was named Bungo because Miri couldn't pronounce it so her father changed it to Bungo. Friend-kun is actually a little version of their father.