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Second daughter of the Tsukishima family. She passed away at age 11 trying to save a girl at swimming camp.
Wakaba Tsukishima was fond of Koh Kitamura and considered him as his boyfriend (unofficially). She was born on the same day as Koh and used to exchange their birthday presents on that day. Koh considered her as the cutest girl of his class, rather his grade. In her 11th year, in a Swimming Camp she passed away trying to save a girl. Her last dream was to see Koh playing in the Koshien as pitcher and Akaishi as the Catcher.