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Enjin got shot, Gisou came to "save" them, making the contract. Enjin wished to survive and that the shooter would begone to exist.
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After getting saved by Enjin from a witch, Gisou saw the potential in her and a days later when Enjin was distant from her, Gisou offered a contract with her, she accepted as she aspired to be like Enjin and wished for her loved ones to be save (she regrets becoming a Puella Magi, and now also Enjin lives with the guilt of another Puella Magi forming)
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Her condition was worsening day by day, Gisou came by, she wished to finally be able to sing and play music again, it became true and she became a puella magi.
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