Moe Academy's Red Moon Awakens Old Memories

[No system + sisters + strong female abuse + no CP + redemption + magic + survival on the deserted star] "Sister, I will take you home." — The red moon appeared and took Ukenana away, bringing her to her biological sister, Utata, who was forced to forget. — In fact, they have seen it before. They lived together until their parents were attacked and killed. The intruders took young Utata away and tortured her. Two years later, she was thrown into a corner of the universe because she had no use value. Uknana and her other sister Ulala could not bear the pain of their family being destroyed. After being seriously injured and rescued, they were forced to forget the existence of Utata. As a result, the only person in the world who knew Utata also forgot her existence. — In the five years after the two met, Uknana couldn't find a way to go back, so she followed Utata to live on a strange planet. With the details discovered during the process of getting along, Ukenana's vague memories gradually became clear. By a certain coincidence, she finally recognized her forgotten sister. But her last family member seems to have reached the last moment... — When Utata was on the verge of death, she listened to her sister humming nursery rhymes with difficulty, and secretly used the magic she could only cast once in her life to send her sister home. "The flowers bloom on the other side, and they are buried in the underworld." She sent her sister through the underworld, to the past where there was no time for tragedy to occur and there was still time to restore everything. — More than ten years later, Ukenana, who had grown up again, stood at the door of her home, looking at her family members who were busy in the house celebrating her successful graduation, and couldn't stop crying. "Tata, today is also your birthday. I am here, where are you?"