A young Japanese high school student and orphan living alone in an apartment. His parents died in a car accident, for which he has long felt guilty because he distracted his father while he was driving. Due to his selflessness and kindness, he was summoned to a fantasy world to serve as a fighter in an adventuring party destined to defeat a powerful Demon Lord. During his time there, he won the heart of his fellow party member Mariabelle, who obsessively follows him to Earth after he is returned following the Demon Lord's defeat. Although he cares for Mariabelle, her overtly suggestive flirtations leave him extremely flustered.
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