Katsuragi Bakugo had been captured and experimented on with Orphnoch DNA, but got rescued by none other than Tsukasa Kadoya himself, who gave him the Faiz Gear and told him to join Unity Academy in order to fight a bigger threat.
(After the fiasco involving the Lucky Clover, both Katsuragi and Marin brought Kagerou and Ruan Mei back to Unity Academy.)
Katsuragi: Make way. Wounded passing by.
(The other students rush them to the infirmary, and then a few hours later, Kagerou finally woke up.)
Kagerou: Ugh...
(Then the students come in.)
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Yukikaze: Sensei? What happened?
Kagerou: (sighs) My past is back...
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Jack: What do you mean?
Kagerou: I used to be an enforcer of Smart Brain, and I was totally hellbent on destroying Union City.
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Kagami: Considering its corruption, it's reasonable for you to want to destroy it.
Kagerou: Pay attention! Ahem. In order to destroy said city, I had my formerly trusted henchmen, who are none other than Lucky Clover. They are a group of mercenaries, and so was I.
(Flashback)
(The Lucky Clover members are seen preparing to attack Union City.)
Kagerou: Attack them all! Make sure there aren't any survivors!
(They nod and attack the city mercilessly.)
(Flashback Ends.)
Kagerou: I used to date a bitchy princess named Malty S. Melromarc, who had an affair with a certain fake hero named Motoyasu. I eventually betrayed the Smart Brain and started using my inventions for a greater good. They are after me, and to be honest, two billion dollars are being offered for my head.