Another revenge isekai!
MC the summoned hero was betrayed and literally back stabbed by his "companions". On his dying breath, he swear that, if given a secound chance, he will get revenge by torturing them all and make their life hell worth than death.
Then woke up back in the past, where his new life in another world started. This time, he will not "trust" those fake smiles.
Nidome No Yuusha