Akikaze
Even if it is usually the ninja that it is not particular about shape of a weapon, there can be a thing fixing form of a weapon by art well.
This Aki cold is technology to confirm curve health of a tool by levelling tools such as weapons for a glance.
When I get every tool ready, autumn wind is used and can always keep a tool the most suitable form.
It can be used by billiards by the present age.
