A third-year student at Senriyama Girls' High School in North Osaka and the protagonist of the manga "Toki". She was named one of Senriyama's ace players for the 71st Inter High School Mahjong Tournament despite being a relatively unknown player prior to it. She's a very sickly and unathletic girl, and is often seen lying face down in her teammate Ryuuka's lap.

Spoiler

Toki possesses the ability to see one round into the future, predicting the draws discards of herself and her opponents, allowing her to call riichi immediately prior to take advantage of the win bonus. During her game against Teru, the champion, Toki's ability evolves, allowing her to look more than one turn into the future, and afterwards, she gains the ability to view multiple alternate futures at once. However, this exhausts her, and it can cause her to faint if she overuses it.