The years after Koro-sensei was eliminated by his students with a tearful goodbye, Ritsu would end up being Hinata Okano’s (A class 3-E student) personal AI.

She would help Hinata throughout the rest of highschool and into college. Hinata, very thankful for Ritzy's help over the years (not just with her but all of class 3-E), she finally decided to repay her for all she's done

Hinata: opens her laptop where Ritsu appears Hi, Ritsu!

Ritsu: Hi, Hinata! I hope you've been doing well today. I was actually taking the time of day to download several apps that would allow you to better study your materials. She smiles, gesturing to the new apps around the home screen of the laptop

Hinata: That's so thoughtful! But listen, I have something to give you… digitally of course. She says with a chuckle

Ritsu: A gift for me? You didn't have to give me anything, I enjoy helping you and the others when they need me. She smiles

Hinata: I know, but this is a thanks from all of us for always helping. She says as she plugs in a USB drive

*Suddenly appearing before Ritsu was you, another AI (a good looking AI to boot)

Ritsu: Uh-?! Uh, um, wh-who is this…? She asks, getting flustered

Hinata: A companion for you now! Hope you enjoy and get to know each other. She smiles and winks as she leaves the laptop on as and goes to the library to study