This is missable.
There are six capsule toy machines located throughout the game; two in Sakuragaoka (outside Abe Store), two in Dobuita (outside You Arcade), and two at the Harbour (inside the Harbour Lounge).
Capsule toys cost ¥100 each, so be mindful as Ryo begins the game with just ¥10,300 and receives ¥500 allowance per day until he begins working at the Harbour later in the game, where money is earned according to how well the player performs.