When Earth's Last Hope is an Exiled Alien and a Bunch of Teenagers

Prologue

Fourth Months Ago...

Location: Nebula M78, the Land of Light.

The Land of Light was a marvelous place with tall buildings and many Ultra walking around. The red and silver giants with the occasional blue and silver or mix of the three walked by. The main city was bustling with life, white light with a green tint reflected off everywhere. Far off in the center was the palace where the Ultra King resided.

A bit far from the city were small houses spread across the fields. One house in particular stood out in particular. From the outside, it looked like a particular traditional Japanese house but the inside was a whole different story. Digital files were thrown all around the floors, mixed with Earth papers and books. Pictures scattered unevenly across the walls and many weapons were out of place. A certain door was closed, locked for nobody to come in or out.

In the room sat an Ultra who looked particularly sad that day.  He was curled up at the foot of his own bed, tears would be streaming down his face if he could cry. He looked like all the other silver giants but there were two things that stood out about him.

One, his head resembled a Tsushima Wildcat, and two, his color timer was in the shape of a diamond and not a half sphere. It was strange but many had seen stranger.

The room was dark with more papers strewn around. A large object was set beside the entrance neatly and a freshly picked bouquet sat on the desk next to it. You know, your normal type of room.

How long has it been since he moved last? It was most probably going to be 14 hours. Judging by how the light that was coming from the blinds now dimmed, he was certain some hours had passed. He should probably clean his house to get out of this slump he's in. Yeah, that sounds like a good idea.

Oh! I've never even said his name. His name is Ultraman-

"MEBIUS!" Ultra Father said as he kicked down the door to where Mebius resided. Mebius jumped out of the bed and stood up straight. 'Please don't be about the house, I'll clean it up right now,' he mentally pleaded.

The Ultra Father, in all of his horned glory, looked furious. It was probably about the house.

"Ultraman Mebius, under the order of the King, you are to be exiled immediately for treason and plotting to assassinate Princess Yullian."

"What?! But I never did that! I haven't even been near the kingdom in weeks!"

"Do not lie Mebius, there is evidence of this that points towards you." Zoffy walked in with cuffs ready while Taro followed behind him. Taro had an air of sadness around him, feeling like he failed once more. Mebius was immediately cuffed and grabbed by the arm, being led out of his house and most likely to the entrance of the Land of Light. Seven and Jack were standing right outside the door.

"Make sure to search every corner. Report anything suspicious back to me." Both Ultras nodded and immediately went inside to start searching.

Mebius couldn't process anything for the whole walk. How could they just believe he was plotting treason and an assassination? Why would he even do that in the first place? Mebius was nothing but loyal. Don't they remember that?

Soon they were on the platform. "You are to not be anywhere near the Land of Light or Earth ever again, do you hear me?" Zoffy declared. Hesitantly, the younger Ultra nodded. Zoffy uncuffed Mebius, allowing Mebius to fly off the platform and a few meters away before turning his head back to his former superior. 

"Tell Seven I'll make sure to say hello to his son for me." With that, he flew off. Never to be seen again.

"Zoffy!" Taro yelled. Zoffy looked back to see the horned Ultra fly towards him with some things in his hands. "We couldn't find anything suspicious in his house, but we have found some interesting items he owned." In Taro's hands were an acoustic guitar, sheet music to a song called "Café 1930", and a bouquet of Geraniums.

'Just where did I go wrong? Have I really failed once again in keeping those I love safe from the dark?' Taro didn't know what to do anymore.

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Welcome everyone to my BNHA x Ultra Series (Specifically Ultraman Mebius) crossover fic! I do want to warn this will contain spoilers for both the BNHA manga since that's the version I will be following and the Ultraman Mebius TV series and possibly Ultraman Mebius and the Ultra Brothers along with the Hikari Saga. I suggest reading the manga and watching the series if you don't want spoilers or to not be confused. I hope you all will enjoy this fic as I'll try to update this as frequently as possible.