Why I Quit Being The Demon King Mangareader

Renta: Aiji Kano has a crush on a student who goes to the same cram school as him, but it's game over before he can even confess his love. Just as he's feeling down, he's warned by his cram school teacher, Yoshito Ayabe, about his dropping grades. Ir

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Kei is a quiet student that doesn't really like adults or teachers too much. However, after getting to know her English teacher, she begins to fall for him. -- Manga Updates

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Leto is employed as an apprentice by the skilled mercenary Alpha, from the mercenary unit Boreas. He struggles to rid himself of his apprentice status and be accepted by Alpha. However, as a mercenary, many painful encounters and terrible experiences

This is the original, pre-serialization webcomic.