Lunaire, a magician turned Youkai, who moved to Gensokyo to avoid his family suddenly found himself thrusted back into the world, along with other residents of the Eastern Wonderland. What will he do? The world he once knew has changed in the way he didn't expect. Instead of being mere folklores, magic became a widespread skills. But something felt different from normal magic.

Hexenkessel, cauldron in German, is a term used to described encircled pocket of military unit. It is within one of these on the Eastern Front that the premier magician of Gensokyo was trapped. Yet, it is neither German nor the Red Army besetting him. Rather it is an enemy most bizarre and unknowable, even to an anomaly like him. The year is 1942 in the strangest Eastern Front yet.

It is the 30th Millennium. Ever since the loss of Explorator GFS Lorelei, Demetorius VII stands at full alert while Humanity holds its breath for yet another hostile First Contact. But no amount of preparation readies them for what is to come. The Aeldari…a name spoken with fear and burning hatred. By their sadistic malevolent, worlds burned. This is Humanity at their darkest time.

What if the answer to Gensokyo's continuation is just like Lunarians, escaping Earth? Unknown to Theldesian, their world was designed meticulously to ensure the perpetuity of supernatural beings. Yet, it is not so easy to use an entire world, so similar yet so different from the one they are used to...as the vanguard will soon find out.