Instructions
Wait until the 7th of Spring. You cannot begin the process to get Candy and Cinnamon until their grandfather, Kanno, arrives on the 7th of Spring of your first year of game play.
Befriend Kanno. Speak to Kanno every day after his arrival. He usually walks around the Clock Tower, but you may also find him on the Mountain Road, the Tavern, the Church District or the Rune Archives.
Speak to Kanno between 11 a.m. and 12 p.m. After a minimum of 2 days after Kanno's arrival, the game will trigger a dialogue in which Kanno will mention that he has asked his granddaughters to come live with him. You must speak to Kanno in the Clock Tower between 11 a.m. and 12 p.m. to activate this scene.
Exit the Clock Tower. After you hear Kanno mention his granddaughters' arrival, the game will cut to a scene in which Cinnamon and Candy appear. You will often find both girls in the Clock Tower thereafter.