When ExS-TIAs was in the verge of defeated by Naiolo, Shihou Souma activate ExS-TIA System and defeat Naiolo. However, due to the system feedback, Souma's body become a woman. And now, while Marina and the others can't fight, Souma has to fight the remaining monsters left in their place.

This will become an alternate story of the second half ExS-Tia 3. After everyone's defeat, what if Souma turn into woman and fight... That kind of situation now can be enjoyed.

[Translated from official site]