The comic references Episode 6 of the original series. Context and what happens in the episode:
Hibiki is keeping her involvement with Symphogears and the Noise a secret from Miku. Miku feels a growing distance between them.
05m35s - While getting dressed after taking a bath together, Hibiki and Miku make plans to go to Flower later for okonomiyaki. 08m00s - Shinji calls Hibiki with a mission and she has to cancel her plans with Miku. 09m10s - The mission is to visit Tsubasa in the hospital. 11m30s - Miku is at a library that happens to be across from the hospital. She looks out the window and sees Tsubasa and Hibiki smiling at each other. 15m30s - Miku goes to Flower by herself. The cook notices her usual friend isn't with her. Miku reveals that she hasn't eaten all day because of how much she was looking forward to eating the okonomiyaki.
Updated
I don't have to say anything, right?(Reference to Episode 6 of the original series)
See Comments section for more infoListen, YukineWell, that makes me really happySpeaking of close friends... Hibiki really loves you too, Tsubasa-san!I might have stolen Tachibana from Kohinata......Hm, is that so...What should I do...Though we are close friends!W-, what are you saying all of a sudden, Tsubasa-san?!I've thought this for a while, but... Kohinata, you and Tachibana have a relationship that seems almost like husband and wifeHusband and...!?