Second part of Enen no Shouboutai: San no Shou.

Ten years after facing defeat in the Fourth Holy Grail War, Waver Velvet, now Lord El-Melloi II, teaches classes at the Clock Tower—the center of education for mages. However, his new status as Lord comes with a caveat: obey the orders of Reines, the younger sister of the deceased Kayneth El-Melloi, until she is old enough to rule the House of El-Melloi. Waver, along with his mysterious apprentice Gray, takes on a series of cases assigned by Reines and the Mages Association. With each case proving to be more complex than the last, could there be more to the Clock Tower than meets the eye, and what secrets does Reines hide?

For the past 13 years, the Nefarious Monster Army have appeared beneath their floating fortress every Sunday to advance their goal of conquering Earth. Luckily, the Dragon Keepers are here to save the day! Having defeated the majority of the monsters during their initial invasion, the heroes now routinely show up to clear away any remnants of resistance. Unbeknownst to the public, however, every fight beyond the first has been a deliberate show put on by both sides: the Dragon Keepers reap the fame and prestige from fighting imaginary enemies, while the surviving weakest monsters, altogether called Dusters, are allowed to live for another day. Sentouin D, a Duster tired of living this life of shame, leaves the fortress in an attempt to overturn his fate. With the unexpected help of the mysterious ranger Yumeko Suzukiri, he discovers the key to defeating the Dragon Keepers lies in their Divine Artifacts—ultimate weapons crucial to the rangers' transformation and unique powers. Teaming up with Suzukiri to infiltrate the garrison of Red Keeper Sousei Akabane, Sentouin D must defy all expectations to save his species from the cruel hands of humans.

Do you know when you are going to die? Michiru Kita does, as she has the ability to see a ring of death on the necks of those around her—and the darker the ring, the closer one is to death. One day, she notices that two boys in her class, Chika Akatsuki and Shito Tachibana, have completely black rings. Seeking to warn them of their impending demise, she stumbles onto their secret: they are already dead, but are kept alive due to a contract with Zombie-Loan, a mysterious loan office. Of course, nothing comes without a price, as the boys must hunt down and kill zombies in order to pay off their debt. And once they learn about Michiru's Shinigami Eyes, they drag her into their crazy world.