This is a posable action figure from the Nendoroid series.
From the Good Smile Company website:
From the popular browser and smartphone game "Touken Ranbu -ONLINE-" comes a Nendoroid of the sword that is not easy to handle but is a good sword - Yamatonokami Yasusada! He comes with three face plates including a standard expression, a combat expression as well as a smiling expression designed to match his "I'm happy. Thank you." line from the game!
His sword can be displayed both sheathed or drawn allowing you to recreate various scenes from the game, and he also comes with the Sennin Dango item from the game that instantly recovers fatigue for your party in the game. Be sure to add him to your collection!