Tsuna's Alien Big Sister

Sawada Tsunayoshi has an older sister who was born one second before him. By the time he was babbling his first words, she had already learned twenty languages. By the time he started elementary school, she had completed her evolution and become something like an alien. By the time he started middle school, she had already flown into outer space. Apparently, that demon tutor of the family had originally wanted his sister to inherit the Vongola Rings. But she had already conquered the stars and seas, becoming queen on an alien planet. Reborn fell silent... After the battle ten years later ended, his sister finally flew back from outer space. And then...