Masiro, who does Overlord doujins, has also been doing a series of countdown pictures. He's looking forward to it too.
You can find them all here.
3 Days - Mare and Punitto Moe
4 Days - Sebas and Tabula Smaragdina
5 Days - Aura and Warrior Takemikazuchi
6 Days - Shalltear and Ulbert
7 Days - Demi and Herohero