Animenewsnetwork - Ninja Slayer From Animation is not a TV show that one should watch languidly stretched out on the couch. If you're not focused enough to watch it while maintaining perfect seiza, the ideal way to experience this cartoon is to stand in the middle of your living room, bedroom, home theatre, or unfinished basement, looming over the TV menacingly, ready to explode into action at a moment's notice. When the title character YEEART!!s, it's crucial to YEEART!! right along with him.