It's been a week since Yumi has been unconscious. That means it has also been a week since the Arkane boys halted their concert. They didn't want to leave her alone, so they agreed to postpone their concert until she awoke. Because of this, they train in secret back in the cabin so they don't screw up when they return to Earth.
Another week has passed, and Yumi has yet to be awoken. At this time, everyone was really concerned. Even the King and Queen offered her a top-tier doctor to keep a record of her health because they didn't want another hero to pass away.
Yumi survived Manananggal's poison thanks to Angela, who arrived just in time to heal her with her creation. Despite the fact that her wound had healed, the doctor advised them that she could have been physically and mentally fatigued, which would explain her prolonged slumber.
[Yumi’s P.O.V]