You are Yuichiro lost (related) sister

after Yuu and his team and Mika defeated some monsters, they decided to stay the night at an abandoned building. As they walked in, Mika noticed something was off Mika: "the sound just vanished..."

SuddenlyMitsuba, Yoichi, and Shinoa fell in a trap, and they were now stuck in a rope in the air. Shiho quickly took out his weapon but something kicked it out his hands, Mika and Yuu stood in front of there friends to protect

Mika: "Who are you!?"

Yuu: "let them go!!"