Stella Vermillion vs Ouma Kurogane

Stella Vermillion vs Ouma Kurogane is a fight between Hagun Academy's Stella Vermillion and Akatsuki academy's Ouma Kurogane, during Akatsuki's strike on Hagun Academy.

Prologue
While on the bus back to Hagun academy Stella and the others find out that Nagi is a traitor whose main purpose for coming to Hagun Academy was to betray them during their impending fight with Akatsuki academy. Stella and the others decide to trust Nagi.

During Stella's bus ride Ouma and six other Akatsuki academy students had came to Hagun academy and one of them had single handily taken out Yuuri and Ayase. They then destroyed the entire school as well.

When the Hagun academy team had finally arrived at Hagun academy to find it destroyed, they also meet the Akatsuki academy members as well. They all line up against each other and charges toward each other but before they can clash Nagi binds the akatsuki academy students and the Hagun academy students defeat Ouma and the others. Amane then appears putting ten swords in his back, in illusionary form, causing Nagi to fall unconscious. Ouma and the others reveal themselves as Stella and the other Hagun Academy students find out they had cut down wooden dolls. Reisen Hiraga then picks up Nagi's body and leaves with it planning to take it to Akatsuki academy, Ikki tries to follow and is nearly impeded by Ouma however Stella is able to stop him, before Ouma is able to hit Ikki. Stella then challenges Ouma to a fight to which Ouma accepts.

Battle
Ouma was blown away thirty meters and Stella had begun to charge up her Laevatinn, Katharterio Salamanda, not knowing what ability Ouma had but knew she couldn't not take him seriously. Ouma then smiles at such an attack answering with his own technique, surrounding his Ryuuzume and using the technique Kusanagi. Stella and Ouma's device then clashed against each other, causing a beautiful cross to spark from it.

During the clash Stella had noticed, much to her surprise and dismay, that she was loosing in power. The longer the clash went the more the wind from Ryuuzume devoured the flames from Laevatinn. Eventually the wind had consumed the flames and Ouma had slashed down on Stella, however Stella, before being cut by Ouma, was saved by Tohka Todo who proceeds to knock Stella unconscious.

Epilogue
Tohka then realizes Akatsuki academy's plan was to take out all of the Hagun academy student participants in order to show their strength and force the seven sword art festival committee to acknowledge them and allow them into the festival. She then throws Stella's unconscious body to the Hagure sisters and tells them to leave, to which they did.

After Stella regains consciousness she decides that in order to fight against someone like Ouma she will have to get stronger. So she decided to train with Nene in order to become stronger so she can keep her promise to Ikki as well as defeat Ouma in the Seven sword art festival.