Daiki Aizawa (逢沢大樹 Aizawa Daiki?)is Natsumi's younger brother (ototo).He is sometimes seen with Keita and Yuusuke,and often seen playing games at home. He is stubborn like his sister and does not belive in supernatural stuff like Saki. He calls Saki (Saki-neechan) which means big sister Saki becaues he has known her for a long time. 

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