"I live to protect my gege."
"If so, then dear didi, I live to protect your freedom."
Go, do anything that will make you happy. If you want to destroy the world - I will prepare the ammunition. If you want to destroy me, before you kill me, call me gege one last time.
Note: gege = big brother; didi = little brother.
http://anisearch.de/index.php?page=manga&id=7620
Art: Chinesischa Novel
Author: Yu Wo
Artists: Blaze, Ya Sha
5 Volumes (Complete) (Author's Version)
4 Volumes (Ongoing) (Commercial Version)
Jahr: 2008-?
Verlag: 御飯糰
http://halfprince.wikia.com/wiki/Yu_Wo