Nikatakatsu
Once upon a time, there was the strongest legendary sword named Ishikatsu which was rumored to be able to split the universe and even destroy it, but over time the sword disappeared from human sight. After the sword suddenly disappeared, there were rumors of a new sword named Nikatakirin or by another name Nikatanokatsu, it is said that this sword is made from fragments of the legendary sword, Ishikatsu. But after nearly 10 000 years of disappearance, many residents in every village and city saw a swordsman wielding a sword similar to the legendary sword, Ishikatsu. A dozen years passed, three teenagers named Kamizuki Shiro, Takazawa Kazuki and Kurozuma Naomi appeared who had dreams of becoming swordsmen. But the three of them are not blood related, Can Kamizuki Shiro and his 2 adopted brothers become swordsmen?