Reincarnated in a depressing erotic world but living a normal life (right?)

Aethoria is a fantasy world where magic abounds everywhere and in which all kinds of fantastic beings roam freely.

It is in this world, in the kingdom of Veridia, that a prestigious academy known as Saint Aethelgard exists, recognized in the kingdom as the leading training school for magic and future highly talented heroes.

This world was in relative peace until the birth of the saint considered the most corrupt in Aethoria's history, known as Sandur, who had created the most depraved cult, recognized for their immoral acts to achieve their goals.

In an attempt to counteract the chaos and restore some stability to the kingdom, multiple influential figures with the potential to become heroes were enrolled in the Saint Aethelgard academy to allow them to develop.

Under the academy's guidance, they were expected to mature while under the protection of Alexandra Highgate, the famous archmage scholar, who has manifested over 300 spells and applications for magic.

It is said that she has lived for over 250 years without showing any signs of aging, maintaining a seductive youthful appearance that fascinates all who observe her.

Thanks to all her achievements and reputation, she was unanimously chosen to be the director of the Saint Aethelgard academy.

After securing the position as director, Alexandra made use of access to all sorts of new magical knowledge to learn more, to the point where she became aware of other universes and the existence of different worlds with all kinds of secrets waiting to be discovered.

Alexandra, motivated by her insatiable desire for knowledge, investigated a way to safely explore these worlds, eventually creating a new spell that would allow her, through her astral form, to traverse dimensional barriers to go to other worlds.

Anxious to experiment, Alexandra decided to test the spell late at night in her office, where everything seemed to be going well as she felt her soul separating from her body while an interdimensional opening appeared.

However...

(BOOOOOOOOOOMMMMM!!!)

"What?!"

She did not expect that at that exact moment a shockwave accompanied by a large-scale tremor, never before seen, would occur, interrupting her concentration and altering the delicate balance of the spell.

"This is not good!!"

Although upon noticing her mistake she tried to stabilize the spell, it was already too late, causing space-time distortions throughout the office that sucked Alexandra's soul away, while other students were accidentally caught in the chaos.

["Space-time instability detected. Initiating collapse suppression and integration."]

Fortunately, before it was too late, a system still without a host was able to suppress the damage.

["Successful integration. Alert!! Soulless vessels of entities relevant to world function detected. Solution: install random souls."]

That night, in an attempt to solve the problem, the system irresponsibly introduced human souls from other worlds into the empty shells left behind by the spell.

["Successfully completed."]

Shortly after this, the system would find a compatible host for its erotic sales functions in another world, while also encountering a boy linked to a dangerous snake goddess with resentment towards systems, being brutally beaten every time he found them.

Meanwhile, the seemingly "normal" boy named Mireya innocently bought the merchandise, knowing nothing.

It was in this way that the cheerful Arisa Reaven and other heroines of the Aethoria world were possessed by all sorts of men who would irreversibly alter the destiny of that world forever.