After activating ExS-TIA system, Souma can also fight now. But due to the system feedback, he turn into woman. The Visual Novel Database Shihou Souma | vndb
An alternate story where Souma activates the ExS-TIA system himself and, due to a feedback loop, is transformed into a woman to continue the fight. Kouyoku Senki ExS-Tia 3.rar
A spin-off where Marina becomes a more traditional "Magical Girl" (Pastel Marie) with a frilly uniform instead of the standard sci-fi suit. After activating ExS-TIA system, Souma can also fight now
The series protagonist and Marina's boyfriend, who supports her in battle. After activating ExS-TIA system
The protagonist's childhood friend who transforms using a Physical Photon (PP) Device to fight invaders.
The game has spawned several spin-offs and parallel episodes: