Nagisa Shiota: The Amazing Spider-Assassin

My name is Nagisa Shiota, although you probably haven't heard about me. I don't blame you, I'm not a person people take a second look at, especially after I was shunned down to Class 3-E at the oh-so-prestigious Kunugigaoka Junior High School, a class known to most as simply the 'End Class'.

After our original teacher mysteriously disappeared one day, our humble little classroom was given a new instructor... an octopus-like creature who was responsible for destroying the moon the day prior. Our mission? To ensure his assassination before his deadline in the following March of next year. That doesn't sound so bad, right?
Try assassinating a superbeing capable of moving at speeds of Mach 20. As you might assume, our chances of killing him at the start of the year were nothing short of zero.

However, my life was flipped on its head after a peaceful lunch in the forest surrounding my classroom led to a radioactive spider crawling onto my hand and biting me. I killed it, but I would soon learn that it wasn't an ordinary spider. In the hours following the bite, I passed out during class and awoke to feel... different. I had gained a sixth sense I dubbed my 'spider-sense', I could stick and climb on walls, I got super strength, and here's the kicker...
shoot organic webbing from my wrists. This seemingly normal spider changed my entire life by giving me, with no adequate word to describe it, superpowers.

I was reckless when I first used my powers and caught the attention of Hida Haruka, a girl my age with similar abilities who called herself "Sakura Spider".
Even if she didn't agree with the things I did at first, it was helpful to have someone show me the ropes with the unfamiliar powers I gained. Even if it resulted from a disagreement at first.
Fighting against the likes of criminals, small-time supervillains, and the principal of Kunugigaoka Junior High turned evil, this is my story about how I became the local would-be assassin vigilante: The Spider-Assassin.