Manga It's Sudden, But I Came To Another World! But I Hope To Live Safely

"Understanding" is "Stronger" than a Sword! No magic without guns!
But! This is the story of a man who wants to live in safety!
"So I'm in another world."
This man stood alone in a mountain full of plants and creatures he had never known or seen before. He descends from the mountain, avoiding meetings with large mucus (and bandits), and he is caught as a suspicious person in the castle where he gets. During the interrogation of the female knight Ilius, who was met in prison when it comes to bandits seen in the mountains, Irias, stuck in search of the mentioned bandits, hastily strikes them. My desire to be a brave man or build a harem?
"I just want to live in a safe place" - the story that such a person survives in another world with "Understanding" as a weapon!