The next day
Carrying Esdeath on his back he travels to the Empire to find some material even though she can walk but she likes it when he carries her. The journey cost only an hour since it not that far from his place.
When he arrived at the city despite he is in the past the place isn't that much different from the anime the only thing he can see different is the bar that Tatsumi went to meet Leone isn't build yet.
Nonetheless, he still arrives at the marketing to buy all the ingredients and clothes with the money he receives from the bandit also buy ice cream for Esdeath. Looking at her smile while eating he is truly happy.
Seeing a crowd is gathering he is curious so he walk to them what greets him is a sight of a woman dead body tied to a cross, her body is tortured with a lot of scars mark, he can even smell the scent of sex.
A fat nobleman standing in the middle giving a speech "As you can see a peasant dare to try to rob my house so I made her an example for all, this is a warning to all those that dare to define me"
Hearing his word anger can be seen in Katsu eyes, Katsu can be sure that girl is just a normal citizen how can she rob a noble house that has guard train in combat even Esdeath thinks he is lying but those commoner didn't talk back even agreeing with him some just avoid looking maybe they are her family or neighbors that know her but afraid of his authority.
"Esdeath this is my first lesson for you try not to trample the innocent if the only choice is killing them to save someone you want to protect then you can do it but never kill them for fun or trample their dignity" silently convert his massage to Esdeath
He turns back and walks away but not before taking out a knife from his bag and throw it into the sky. Of course, no one sees his quick action except Esdeath and a certain blond girl hiding looking at the crowd from the rooftop.
The knife drop from the sky hitting the noble head dropping him dead. Scream and shout can be heard after Katsu leave.
The blond girl seeing Katsu leaving. She silently follows him jumping over from buildings to buildings but as she is jumping she sudden stop when seeing him now standing in front her
Knowing the girl is following, he already climbs the building to meet her. From his guess, this is the past Leone seeing how resemblance to her future.
She took out a small bag of coins and give it to him "Thank you for avenging her she took my place and I can't do anything but watch her being taken"
"How about I take this money and train you for 1 month to fight back those greedy bastard" hearing katsu offer she hesitates a bit but with a firm determination she accepts his offer
"Welcome to the family I am Katsu say hi to your sister Esdeath" he chuckles before pulling Esdeath down. The two look at each other he doesn't know why but he can feel the atmosphere is a bit wrong and sparks are flying out of their eyes clashing against each other. After a solid 5 minutes, Leone finally said her name.
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"Okay, I will just assume that we already friend let go then," he said before carrying Leone with Esdeath jumping on his back, rush back home before those guards lock the place down
After arriving home he also introduced the invisible spirit Black magician girl, she appears in her human form with a cute introduction. Her appearance clicks in Esdeath's mind why she always feels another person is watching her.
The two girls didn't dislike her and even greet her back. He doesn't know it is the Black magician girl's charm or her natural ability to befriend people she quickly becomes the older sister of the group that everyone likes.
Of course, he introduces her for a reason is to teach magic from what he learns that he can gain a monster card skill if he consumes it but what about teaching it. The last time he uses Monster card Vorse Raider when it ejects out of him can't do technique like when he uses but he becomes more profane in axe bears weapon and, when he asks if Black magician girl can teach magic to people she confirms that everyone can learn magic but how much depends on their ability.
When she explains the theories to use it Esdeath, Katsu can understand and take note of all but Leone becomes brain dead. She is teaching about mana, which is the life force energy that consists in everyone and every living thing different people have a different amount of mana it like stamina but also different, Where stamina is a measure of your physical reserve, mana is your mental reserve. Mana isn't used to casting spells but to fuel the spell to work. That is, if you have an idea in your head, mana provides you the ability to express that in play and turn it into reality because some spell is too strong it needed a place to channel it and gather the mana if the container isn't strong enough the spell will be broken that why sneed a wand and this book. The wand to channel the spell and the book holds the theory of the spell but you can do the spell by hand but people tend to use a wand because it is easy to chant the spell and gather power. (different world have different concept okay when you meet other worlds in the future that when you will explode and many plot hole will be created but I still write this for fun and this is my story so any disagreement can go fuck themself of course if you can give any good suggestion I can edit it. Also, believe me when I tell you it will get complicated)
At this point Leone is lying dead already while Katsu has a light headache only Esdeath tries to do it and succeeds in creating a small ice shard but that causes her to become a bit weak. "This is your first time and you are still young so your mana capacity is small but you can train every day to increase it" to the Black magic girl surprise Esdeath succeed in her first time she received a bit of a stunt but still give out advice for Esdeath.
After three more hours of the session, he can finally can do simple spell by hand mostly boost spell but it already a game-changer in battle while Leone didn't learn a thing.