There is an estimate quoted in the manga that freight shipments range from 4 to 5 per year per farm plant, with one shipment approximately every 2 months. The diagram below is organized according to the age of the characters in 2047.

With this info, it is possible to estimate a birth order.

Isabella and Krone both have their numbers ending with 84. However, by reading the numbers back and forth, they have a clear order.Īll children at Grace Field House have their numbers ending with 94. At first glance, the numbers appear to be random, except for the fact that they all have five digits.