Koshiro is one of the 9 Tomoe Beasts made by Yajime Otsutsuki. Koshiro is the 1st Tomoe Beast,being a white snake with snake sage eyes and a big black tomoe on it's back. Koshiro protects Otogakure as he claimed the area around it to be his territory. Koshiro did not trust Humans at first until the Otokage struck a deal with Koshiro. The Otokage promised his village would protect his territory if he gave his power to him. Koshiro agreed surprisingly.The Otokage went through a sealing ritual in which Koshiro was sealed into The Otokage. Since tailed beast hosts are called Jinchuriki,Tomoe Beast Hosts were now invented and named Hamaki.(I'll have more soon)