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About : Black★Rock Shooter (OVA) Despite the little screentime the interaction between Hiro and Mato seems to be the typical stubborn sibling relationship. When Mato's mother tells her to wake up Hiro, Mato moans in protests but does so, stating that Hiro never listens to her when she tries to wake him up. Her mother simply says Onee-chan, a tone reminds Mato that she is his big sister. Mato's method to wake up her brother was to open the door and give the order that school started that day, when Hiro d...