Speech Bubble

Speech Bubble is an instant messaging app used in Academy City. It allows users to add other users through their IDs. It doesn't have a username feature.

Dream Ranker Arc
Both Saten Ruiko and Frenda Seivelun used the app, which allowed them to communicate with each other after they met.

Jailbreaker Arc
Two members of Shokuhou Misaki's Clique sent messages that Kouzaku Mitori and Dolly are safe after the Jailbreak Trial.