A possible concise summary is:
Four friends visit a ninja village in Japan to learn ninja skills from a master named Tenzen. They have to recite a phrase before throwing shurikens, walk on bamboo, swing on ropes, and jump on a trampoline. They also have to endure being hit by a baton every time they laugh or make a mistake. The master tells them random facts about ninjas and fireworks. They end the video by asking for subscribers and saying adieu.
Here are the key facts extracted from the text:
1. Fischer's Silk, Ndaho, Zakao, and Masai visited Ninja Village.
2. They met a teacher named Mr. Tenzen.
3. Mr. Tenzen is also known as Sakaguchi, but the students are allowed to call him Mr. Tenzen.
4. The students underwent ninja training, including shuriken throwing and bamboo walking.
5. Mr. Tenzen taught them a chant: "May the watching presiders over warriors be my vanguard."
6. The students attempted to recite the chant several times, with varying degrees of success.
7. Masai was tasked with throwing shurikens at a target, but initially missed.
8. Silk, another student, successfully threw a shuriken into the target.
9. The students learned that anyone can be a ninja, but heart is important.
10. The video ended with a message asking viewers to subscribe and follow the group on social media.