[20200327][Announcement] Reward changes

The monthly reward was animation + CG

But I think this O-14 is not bad, so I decided to make Not too long animation

Replace this month's  animation , Hope this decision won't be too bad

本來每個月的獎勵是動畫+CG, 

但這次的O-14老孟覺得還不錯, 所以決定也做成短動畫

來取代這個月的動畫部分, 希望這決定不會太糟糕