Yuuki's trademark is being full of energy, but lately she's been late to the lessons, making mistakes, and overall not being like herself.
When Chisa, Airi, and Yuzuha ask Yuuki what the issue is, she replies that she's helping at her parents' restaurant because it's so busy.
But that can't quite explain the situation.
As Project Himmel's live show is coming up, the members bonding closer together is essential, so what is going on with Yuuki at this crucial time?
Apparently, it's because 
he had overworked himself.
.لأنه ضغط على نفسه كثيرا
Anscheinend,
weil er sich überarbeitet hat.
Lo internaron por exceso de trabajo.
Lo internaron por exceso de trabajo.
Et ce serait pour surmenage.
Pare che si tratti di sovraffaticamento.
Ao que parece, foi porque
exagerou no trabalho.
Похоже, он перетрудился.