亦野 誠子

Seiko is a second-year at Shiraitodai High School. Like her nickname "The Fisher", she has a calm and patient attitude, such as when her teammates doubted that she actually had beat Awai, she was only disgruntled for a moment before describing how she actually did.

Seiko's ability is to easily declare repeated pon, which is depicted as catching the tile that she just called with her fishing rod (fishing out tiles from the pond aka the discard pile). After her third pon, she will usually tsumo within five turns, making her a fast player. While playing safe, Seiko relies heavily on suji and honor tiles. The limit of 5 turns on Matano's ability allows her to rebuild her hand and make a valid yaku, as after 3 calls, you can only have control of 4 tiles in your hand.