After Kokabiel was killed by Michaelus and Vali, Kuoh Academy became peaceful again, until a certain pervert returned with a hint of revenge.

Issei: That stupid Prime, taking Rias away from me. He's about to meet his ultimate enemy, ME! I'm supposed to be the Harem King! And he took my Rias away!

Unknown to him, The Fallen arrived to put a stop to Issei.

The Fallen: You think that you can destroy Michaelus and Rias's happiness? You better think again.

And a certain Blackbird jet arrived and transformed. The jet's name was Jetfire.

Jetfire: And what you're planning is not going to happen, little scrap.

Michaelus and Rias noticed Issei returning and being stopped by Jetfire and the Fallen.

Rias: The Fallen?

Michaelus: And Jetfire!

Issei is pissed off at Michaelus and then the Autobots and Decepticons arrive as well.

MoonPhoenix: What's going on?*sees Issei*That PERVERT! What in the pits of Kaon is he back Here?!?

Issei: Your son is scum! And I'm going to get Rias back! And That's FINAL!

He fired a Dragon Shot from his Sacred Gear and hit Jetfire, wounding him completely.

Jetfire: ARRRGGGHHH!

MoonPhoenix: JETFIRE!

Issei fired another shot at Michaelus almost hitting his spark.

Michaelus: AAARRRGGGHHH!

Issei ran to the top of the school and prepares for a plan to make every girl afraid of him.

[There should be a GIF or video here. Update the app now to see it.]

(Replace the Fallen with Issei and he works alone with Ddraig)

Michaelus was merged with Jetfire's parts to become an even powerful JetPowered Michaelus Prime!

The Final Battle begins Next Chapter!