Sword Art Online: Alicization Running (Novel), Vol. 10

Kirito has wound up in another mysterious fantasy world again. In this VRMMO-ish place, the first person he meets is the young boy Eugeo. Kirito can hardly believe Eugeo's an NPC when seeing his rich emotions and thoughts and ends up heading to the capital, Centria.

Two years later, Kirito and Eugeo have become First Order initiates of the North Centria Imperial Discipline Sword Academy and have been taken under the wing of their seniors, Soltirina and Golgoth. As they train and learn, they do nothing but strive to become one of the highest keepers of peace and order in the human realm, the Integrity Knights.