The final base

Since that day, Kairen was not allowed to use his mana ever again. All he was permitted to do was to... play with his power and try to improve it without even thinking about using man. After arguing- talking to Aaron over the phone, his master, captain Neal, watched Kairen all the time when he was training and if he used even a single drop of mana, she... would nearly beat Kairen up. 

But in the end, Kairen managed to achieve the thing he so wanted.

The permission to take part in missions!

If this was half a year ago, he wouldn't believe that he was trying so hard to be allowed to go on some dangerous missions that he might get killed... and he still honestly preferred working with Glenn than doing some dangerous stuff and killing people... But that job was really boring and... He felt so useless all the time and... He was just a little bit, a tiny bit, envious that others could do missions with his brother, and... he also like to fight alongside him...