Blue Drop: The Angels' Play

Five years before the story begins, all residents of Kamigakari Island suddenly died due to an abnormal, irresistible force. The only survivor was the young protagonist of this work, Mari Wakatake, who also lost her memory due to the immense shock. Raised by her grandmother with a strong emphasis on independence, Mari was entrusted to the private Kaiho Academy when her grandmother's health declined. At school, she met Chikako Senkouji, who appears to be a model student but is actually the captain of an alien vanguard battleship, along with several roommates of varying personalities. Through their continuous interactions, they gradually developed inseparable bonds.