>>530998189
>...so why exactly did Rio have to use?
Remember, Rio before that scene had no idea what was happening, she didn't know who was behind the attacks and what they wanted from the expo.

She wanted to use the program to fully know her enemy, not to "stop them"

They didn't need to use the program anymore because Seia deduced the motive behind the attacks and Mirai appeared in front of them.
The only thing that sensei did was defeat her goons. Mirai was the key to all this and she revealed herself.

>>530324510
>what is her momos theme?
She is a girl failure and your daughter