Okay so I just found out about this one recently, but apparently there's a new song sung by the VA of the Quintessential Quintuplets! 

I was just scrolling through instagram today and my friend sent me a post that rocked my world.

So it was form Itou Miku's instagram page and if you don't know who that is, it's the voice actor for Miku in the anime. So anyway's she posted a picture of her cosplaying as Miku and had in her hands a sort of CD. 

Unfortunately I can't read Japanese but luckily my friend can and he sort of translated it for me. But basically they have a new song out! 

Also I researched more into this and many people believe that this was going to be the new quintessential quintuplets op next season as they finished recording it so it would be ready for the original release in October. 

Now I could be very wrong but I don't care the song slaps so here it is, it's on Youtube if you want!

https://youtu.be/Z2UF9BlN8_s