Natsuarashi — Lost in a Forgotten Otherworld

Akio Sato always wondered what it would be like to live in an isekai.When it finally happens… nothing goes as expected. No system, no special abilities, and no guarantees—he must survive in a world where effort doesn’t promise reward, and even the rules themselves seem broken. With his younger brother’s fate unknown, Akio moves forward as an adventurer, trying to make sense of a world that refuses to make sense.