Nageki no Bourei wa Intai Shitai - Saijaku Hunter ni Yoru Saikyou Party Ikuseijutsu

From Yen Press:
In a land where treasure hunters scour vaults appearing from the past, Krai Andrey and his friends swore a childhood oath to become the mightiest heroes of all. There’s just one problem: While his old companions have become living legends, Krai is the poster child for mediocrity and he knows it!
But despite his best efforts to leave the treasure-hunting life, he has gained quite the reputation by association and with it, enormous expectations. Can Krai pursue his dream of retirement or is he destined to fail forever upwards?

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