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A powerful half-elf spell breaker from the world of elves. His power is oriented towards destruction which also includes seals and barriers and magic. The younger brother of Serge, they share quite a few similarities with each other. The desire to save their mother from the wounds and damages incurred from the Church's experiments prompted him and Serge to join Gekkou's student council in the human world, after they have helped rescue their mother, Ela of the East.
Like all half elves, he has a line on his forehead. Hasga has deep blue hair and golden eyes, also wearing a vest and torn pants like Serge.
Unlike his elder brother, he is shown to be temperamental and quite hostile, as seen when dealing with Haruka.