I Have No Sense of Existence

You can't see me, and it has nothing to do with me. I am passerby A, cannon fodder B, and bandit D. If he beats you, what does it have to do with me, a passerby? A classmate saw a long... Person who looked like a human. He had a mouth, a nose, two eyes and two ears, and that was about it. Ah, my stars, your stars, what does that thing look like? It should be similar to a human, maybe it's a human, This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.