Haburare Rune Tsukai no Isekai Boukentan

Akimitsu Tsukasa and his classmates were abruptly summoned to another world, but what should have been a shared adventure quickly turned into a nightmare. Betrayed by the one person he considered his closest friend, Tsukasa was cast out and left to fend for himself in an unfamiliar realm. He eventually drifted to Aiguille, a harsh territory inhabited by a horned race of demons. There, he survives on the razor’s edge of death as a freelance mercenary, relying entirely on Seal Technique—an outdated form of magic granted to him as a parting gift during the summoning ritual. His grueling daily struggle is suddenly interrupted when Matsuzaka Mihono, a childhood friend from his original world, appears before him without warning. She arrives with a desperate plea, begging Tsukasa to save her sister, Shihono. Forced to confront ties to a past that abandoned him, Tsukasa must weigh the risks of venturing further into danger. As he considers her request, he sets forth a specific condition for Mihono—one that will determine whether he steps back into the fray or leaves his former life behind forever.