A group of Touken Ranbu characters consisting of the swords that belonged to the family of Date Masamune (Real Life): Ookurikara, Shokudaikiri Mitsutada, Taikogane Sadamune, and Tsurumaru Kuninaga.
Date Masamune (Real Life) (1567-1636) was a powerful daimyo and "one-eyed dragon" known for his tactical skill. As not all of them were owned by Masamune, the group is instead known as "Dategumi" by fans.
If Masamune is in the image, at least two of his blades must be present.