Osamu Mikumo and Shūji Miwa vs. Hyrein and Mira

Osamu Mikumo and Shūji Miwa vs. Hyrein and Mira is a fight between Osamu Mikumo, Shūji Miwa, Hyrein and Mira. It is the first part of the final fight of the Second Large-Scale Invasion.

Prologue
Chika is turned into a Trion cube, so Osamu rushes back to Headquarters to try and turn her back. elsewhere Karasuma fights Hyrein, however he is forced to Bail Out and so Hyrein goes after Chika. elsewhere Yūma is fighting a losing battle against Viza.

Aftermath
After almost making it to the base, Replica is bisected by Mira's trigger and thus it can't use most functions. However Osamu makes one last run for it, and gets stabbed multiple times, but then turns off his trigger to continue, meanwhile Miwa uses Viper, and heavily injures Hyrein and Mira and then gets sent far away while Yūma is able to defeat Viza by sacrificing his combat body and goes after Osamu. With 7 seconds until the crossroad of fate Yūma uses one last compound seal, Miwa switches to Fujin, and Hyrein chases after Osamu.