In the জাপানি কমিকস মাঙ্গা Kisa is actually older then Hiro. Kisa ranges from beginning of the জাপানি কমিকস মাঙ্গা to the end to 12-14 years of age, while Hiro ranges from beginning of জাপানি কমিকস মাঙ্গা to the end 11-13 years of age.
In the জীবন্ত they are also about 1 বছর apart in age with Kisa being older and Hiro being younger.