Filled with monotony and loneliness in his long life, the Demon King Lupa, sealed himself into a crystal coffin made of ice and abandoned himself into the void. He intended to stay there and sleep for all eternity.
Until one day…
[ ....Scan complete, potential host's compatibility is 100%.... proceeding to bind with the host...]
[Binding successful.]
[Congratulations dear Host! You have been chosen due to your special unique abilities! I am your newly bound Training system, Trainie! ~\(≧▽≦)/~ ]
…He was unsealed and chosen by a strange system to use his natural abilities to help repair the fragments of the system’s Lord that were scattered in different worlds.
Demon King Lupa thought that maybe his days would no longer be so dull.

Author's note: This story contains monsterf*ck scenes, and after a certain world, the MC becomes an intersex. So if neither of these are to your liking, then this story is not for you.
(Also, Trainie is a s*x training system.)

With the creation of different dimensions and universes, came forth intelligent beings. To regulate these dimensions and universes, higher beings took control of containers called UniOrbs. These containers not only regulated the Gods and the souls of those worlds but also dictated the processes of reincarnation. The UniOrb could not do this on their own, so they contracted souls to become "Systems" that made sure souls were able to reincarnate, but not all souls were fortunate enough to do so. "Systems" then teamed up with souls called "Hosts" to make sure unfortunate souls got their wishes fulfilled, their souls healed properly, and ready for reincarnation. To make sure the Systems and Hosts had a proper base of operations, the UniOrb created a separate space called the Command Center. This Command Center was at the entrance of the reincarnation sea, where souls would go to their next destination. The person in charge was called, "God System."

One System was not satisfied with their status quo. They created something known as the "Villain System." This Villain System was designed to suck the life and energy from different worlds, using it to spread a virus that would slowly take over the UniOrb. Their goal: Take over the UniOrb to become the new higher being that controlled it.

When all hope seemed to be lost for those in the UniOrb and its Command Center, one System, System 225, gained control from the Villain System, rescued his "Host," and together go from world to world, gaining enough energy to combat the System that created the Villain System.

Oh, and also rescuing God System along the way.

Lachesis, the goddess of fate, made an egregious mistake when she prematurely took Kai's life. As a celestial apology, she drops him into a world inspired by his favorite book, where figure skating reigns supreme, love engages in battles of wit, and second chances carry an icy price.

Kai Ito, whose life had been a struggle with pain and illness, anticipated nothing more than eternal darkness following his abrupt departure at the tender age of 19. However, he awakens in the enchanting universe of "Ice Heart," a web novel that had been his refuge during the relentless hospital stay.

Entrapped within a narrative mirroring his own world, Kai confronts an imposing challenge. To earn a second lease on life. To do so, he must glide through the frosty terrain of unrelenting ambition and treacherous competition.

His nemesis? None other than the novel's infamous villain, Toma Mizushima—a character as beguiling as he is wicked.

As Kai wrestles with his own identity in this frozen tapestry, he discovers that rewriting the script of "Ice Heart" holds the key to his salvation. Yet, the path forward is as perilous as ice on thin water.

Toma's nefarious plots have cast a shadow over the world of figure skating, and Kai must outmaneuver the very character he once admired from the sidelines.