Ichiban Ushiro no Daimaou - Volume 6, Chapter 1 — Chaos Over a Date

Ukei Kaito fought a desperate struggle in order to fulfill his role as a summoned hero. He defeated the Demon Lord and saved the very world, only to meet an end filled but with betrayal. The companions that he’d trusted throughout his journey betrayed him and killed him by sticking a blade through his chest.

Transmigrating to a lawless person and then directly upgrading to a little brat’s stepmother. Xiao Ting said, “Crap, there’s no need to even give birth to a child. God, I love you so much …”

- Description from Novelupdates

Kuramoto Daisuke, a freshman in High School was suddenly exposed to someone vanishing in front of him. Turns out he was admitted to a Special Class full of Isekai Heroes that were regularly summoned to Otherworlds since the start of their Middle School. He was told that he was to become their Support to prevent each of the Heroes' fate of dying in the world they were summoned into. Though mediocre, he realized that his ability has a great potential but it needs a lot of hard work on his part.

Unconvinced of being just the Support Character, he vowed to excavate his mediocre ability, all the while supporting the Heroes using it.

And maybe more.

Welcome to a world of survival!While they were here, they had to forget about everything that they used to possess and work hard to stay alive!From the start, aside from the seed for a treehouse, they had no other equipment. They needed to find the hope to survive in this jungle fraught with danger.[Unlocking the authority of the creator of this world of survival.]What was happening?![Failed to unlock the authority of the creator.]What now?This was a strange world. In this world, there were countless new fateful encounters and unknown discoveries.This is a story of adventure, focusing on exploration, land reclamation and unlocking the secrets of the world. It is a story about uncovering the truth behind the world. It is not a slow-paced kingdom building story.