Xin (シン) is the grandson of one of Heiyue's elders.
Xin visits Crossbell to learn about foreign cultures and societies in order to become a successful successor to his grandfather.
Heiyue - Crossbell Branch manager Cao Lee files a request to show Xin around town. He immediately inquires whether Mayor Dieter Crois or performer Ilya Platiere is among the Special Support Section members. Although disappointed, when he learns their name he realizes they were responsible for clearing the Cult Incident, of which he heard from his grandfather.
Then his eyes falls on Elie MacDowell and proclaims her the woman of his dreams, praising her pearl-grey hair and lovely proportions. Elie, Lloyd Bannings and a character of choice show Xin around Crossbell City, bringing him to the places he wished to see.
He later returns to Calvard by train.
Xin is first seen with Cao Lee and Lau, worried about the potential outbreak of war. He refuses to leave Crossbell as he does not want to abandon Elie.
He later accompanies the two to Geofront's Block X where he encounters Class VII. Elie arrives with Estelle to save the group from their archaisms. He was happy to see Elie again, indirectly ordering Cao to go easy or he wouldn't forgive him for harming her.