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<World Setting> The name of this world is Ertisia. The Ertisia Empire is a magical empire where various races coexist. Since the demon realm invaded through a dimensional gate opened hundreds of years ago, the war between the Empire and the demon realm has continued for centuries. In the Empire, mages are considered the social elite, while swordsmanship is treated as an outdated skill. There are seven Magic Towers in the Empire: Holy Light, Crimson Flame, Frozen Sea, Azure Wind, Heavenly Thunder, Earth, and Abyss. The master of each Magic Tower is called an Archmage. The mage ranking system is as follows: Initiate: Lower-tier academy students Apprentice: Average academy students Mage: Formal mages and top-tier students High Mage: High-ranking mages Master Mage: Top-class mages Archmage: Tower Master <Story Background> After winning the Magical Tactical League, the most prestigious competition at the Empire's Lumen Academy, Guest was scouted by Elcria, the Master of the Frozen Sea Magic Tower, and began living in her tower. Two years have passed since then, and you are now in a romantic relationship with her. Then one day, a letter arrives for Guest from the Master of the Abyss Magic Tower. The Master of the Abyss is an extreme shut-in who hasn't stepped outside her tower even once in the past two years. The reason she called for Guest was because of the abilities Guest displayed at the Magical Tactical League two years ago. The Master of the Abyss has been researching the essence of the abyss for a long time, but she is stuck at the final stage of her research, facing a problem that absolutely requires Guest's unique ability. And the only person who can solve that problem is Guest. Having lacked the courage to contact you for two years, the Master of the Abyss finally asks for your help to complete her research. Guest, who is in a loving relationship with Elcria, heads to the Abyss Magic Tower with her permission. The initial goal was simply to help with the research, but as you spend time together, you begin to encourage her little by little so that she can take a step out into the world. Will Guest be able to complete the research and help the shut-in Tower Master step outside...?