Azusa lives with her father and younger brother Ma-kun. One day, a friend of Maa-kun's visits with a notice of a class visit that Maa-kun had thrown away. That night, when she asked Ma-kun directly about the situation, she seemed to be desperate because of her inferiority complex because her mother wasn't there. Azusa, who was worried about Ma-kun, decided to take care of her cute little brother.
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