Why did my familiar have to be, a demon lord from another world?! (Discontinued)

Chapter 1: The first encounter

In a land that is simply known as "The Void", a young girl is seen standing in front of a wall with various different clocks decorating it. She grabs a book from... No where, and begins to read it.

At 15:18 pm, on the 28'th day in the month of April in the year 2021, a young man is seen walking around in an anime convention, dressed up in some casual clothing. This young man bares the name: Anthony Ryuto Kagami -age: 25-, or you could simply call him Ryuto or Tony, whichever you prefer. He is there because he was supposed to meet up with his two other friends, but had unfortunately called ahead and said that due to some complications, they were unable to join him. Saddened by this, Ryuto simply uses the time he has now and proceeds to explore around the convention, buying multiple merchandises of his cosplay's name-sake, not knowing that in doing so would guarantee his invitation to another world.

And thus begins his adventure to another as a familiar, and his ascension as the new demon lord of time!

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"Kamen Rider Zi-O" OP

Performed by Shuta Sueyoshi feat. ISSA
Music & Lyrics by MiNE / Atsushi Shimada

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isshun de tsukamitoru no sa Are you ready?
atarashii rekishi wa soko ni Feel it! Feel it!
hikari wo kate ni kasoku shite
kono mama Shout it out! Shout it out!
ima wo susumeyou

madou hi mo ikudo to naku asu no tobira tatake
mitsumeta sono saki ni tobikonde mitara
Believe yourself!!

Now, Over "Quartzer"
toki no ame surinukete tomo ni
You, Over "Quartzer"
mirai wo koeyou
kako no ishi wa uso de wa azamukenai
kanjiro sou Nexus Future
Now, Over "Quartzer"
mabayui sekai misete

keiken ga toikaketeiru Are you breaker?
utagau hima ga nai hodo ni Feel it! Feel it!
kodoku nante hitori yogarisa
kono mama Shoot it out! Shoot it out!
negai kakageyou

seikai wa hitotsu janai yamiyo ni mimi sumase
mitsuketa sono kodou hibikasete mitara
Believe yourself!!

Now, Over "Quartzer"
toki no sora kakiwakete tomo ni
You, Over "Quartzer"
yoake wo tsugeyou
dare no tame ka nan no tame no yume ka
michibike sou Nexus Future
Now, Over "Quartzer"
arata na sekai egake

tatoe tooku hanarete itemo deau hazu sa
kasaneta sono itami
kizanda chikai to (hoshi ou kiseki to)
hate naki tabiji de

Now, Over "Quartzer"
toki no ame surinukete tomo ni
You, Over "Quartzer"
mirai wo koeyou
kako no ishi wa uso de wa azamukenai
kanjiro sou Nexus Future
Now, Over "Quartzer"
mabayui sekai misete 

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Million of light years away from Earth, in an unnamed planet, in a country that is oddly shaped like Belgium. Tristain's school of Magic is currently having one of its most important lessons. Summoning. Every second year student is required to summon at least one familiar to aid them in anyway possible. But, rumor has it that on this particular year, a single student is having a hard time practicing magic. The name of the student in question is: Louise Françoise le Blanc de la Vallière, youngest daughter to Duke and Duchess Valliere. And due to some complications to her casting, most if not all of them end up as an explosion. And because of this, she was given an ultimatum: Successfully summon a familiar or leave school and be forced to marry to some nobleman. So lets give her a helping nudge.