Major tourist destinations in Japan have these type of umbrellas, which are good selling at souvenir shops!
Samurai soldiers are entirely extinct in modern Japan. If you want to act like a Samurai, this item will be a great help. Put on casual Kimono coat, hold this umbrella, and make a confident posture. Then you are the last Samurai!
It is safe as long as you don't poke with evil intention against your play partner. Why not get one for yourself?