セブンス 7th 1 - Sevens (2020)

From the introduction:

Long, long ago, humans were the only race on this planet with great technological advances… and yet nothing is built to last forever. Many things happened and the 10 goddesses that shaped the world, from Nihil to Novem, they did their best to make a word according to their beliefs. Even going as far as reincarnating their memories once and once again in search for a better future.

Now the world is divided into various kingdoms, magic is real, being wielded by nobles and their relatives, everyone has an ‘Art’ a single skill that allows them to fight back against the monsters and dungeons that abound in the world. Adventurers are commonplace, if treated more like bandits or mercenaries in most cases, and the technology is a mismatch, with carriages pulled by horses being the norm, but also having flushing toilets around.

Today, Lyle Walt, an heir to a Count House of feudal lords with more than 250 years of history as Feudal Lords in the Bahnseim Kingdom, will be defeated by his little sister Celes Walt, and driven out of home in disgrace. Only accompanied by his former fiancée Novem Forxuz and a Gem turned Jewel that hosts the memories, personalities and Arts from the seven previous heads of the Walt House, he will embark on a journey that will change the continent at large for many years to come...

But this is not his story, this is yours, jumper.