Tras una lucha pérdida contra la UNSC y tener que realizar un aterrizaje forzoso en donde solo 8 miembros sobrevivieron, nuestros protagonistas tendrán que sobrevivir a este nuevo planeta hasta que sean contactados por Gran Caridad, sin saber que en aquel mundo les aguarda un viaje inesperado y sobrenatural.

Spartans are the protectors of humanity. Headhunters are the sword of humanity. Both are required to fight for their species unto their dying breath. However, when death finally comes is that duty maintained? Does it continue as long as the mind can remember it? Regardless of the answer, a Headhunter must find a way to continue his duties. Even if he is no longer human.

This is a start of a multi crossover. Issei has the power of possibility/void/potentiality or the ability to be everywhere and nowhere. OP Issei eventually. Issei will have his harem. He will help many and gain allies. Less perverted Issei. What happens when a child is born with the ability to be everywhere yet nowhere? Adventures large and small with friends and family.

Luego de una vida dura, Issei esta preparado para enfrentar ante las amenazas del mundo y hacerse de un nombre y ser respetado por todos, de todos modos, por el tiene sangre de Spartan y el sera el nuevo Spartan Sekiryutei. Issei Serio, Mercenario y IsseiXHarem.

"When I saw him, I fell at his feet as though dead. Then he placed his right hand on me and said: 'Do not be afraid. I am the First and the Last." -Revelation 1:17

Something falls out of the sky, so Rias and her peerage investigate, but they will soon learn truths and revelations thought to be lost to time. And what exactly does Ophis know about the Halo Array?

During the battle on the planet Korthal, an ONI agent was suddenly sent to a universe where devils exist and supernatural incidents are an everyday norm and worst of all, meeting his perverted parallel counter-part which looks like him but shares nothing like poor ONI operative Ichiko Uni. [I DON'T OWN HALO OR HSDXD]. (I am a new writer so go easy on me) I

Teleportation. Not John's favorite method of travel, but when a teleportation procedure get's interrupted, Spartan-117 get's stranded in an entirely different timeline. How would one of humanities' greatest fare in a Japanese high school that just recently become co-ed and fight against the forces of evil...and good?