異世界ホテルへようこそ～魔族で勇者な最強姉たちから溺愛されて困ってます～

His parents died in an accident when he was in junior high school, and his younger brother, Towa, who doted on him, and his younger brother, Lee, were left alone, but three years later, Towa also disappeared. After that, even Lee is summoned to another world and reunited with Towa. Sister Towa has become the strongest hero in another world!?