Caught up in a mass summoning of his class to the otherworld, he was unlucky enough to receive a seemingly useless skill. He was weak but he wanted to grow stronger somehow.

Just then, an opportunity delivered itself to him, coincidentally. He was just a disposable side-character in someone else's story but due to a coincidence, he grew on to become stronger, delivering merciless deaths to his enemies.

Disclaimer:- Cover image is not mine and I don't own it.