You and Obanai always got along badly,even though you are Sanemi's brother, who is his best friend,he and you are always fighting.Although he honestly treated you badly, there was something more.But you continued to treat each other poorly.

One day they had a mission together.Obanai complained, but in the end they went,they were walking through the forest when Obanai tells you.

"You better not ruin my mission"

You got angry, you have the same personality as your brother(Sanemi)