The ending of 'Release That Witch' ties up Roland's journey beautifully. After building Nightingale City and revolutionizing the world with witch-powered technology, Roland faces the final battle against the demons. With the combined efforts of his witches and the Kingdom of Graycastle's army, they destroy the demon's core, ending their threat forever. Roland then establishes a new era where witches are respected members of society, and science flourishes alongside magic. The epilogue shows Roland and Anna, now married, watching over a peaceful, progressive world. It's a satisfying conclusion that rewards readers for following Roland's transformation from a modern engineer to a visionary king.