Leticia, or rather, Leticia Draculair.
She is a member of the Vampire race, once known as the "Knight of Little Garden".
The structure of Little Garden, taking into account the lives of vampires and other nocturnal creatures, deliberately set up a curtain to cover the entire city.
This transparent barrier, called the "Curtain", has the effect of filtering out the toxicity of sunlight.
Therefore, inside Little Garden, nocturnal races such as vampires can appear outside without any obstacles even in the daytime, and can even receive sunlight without harm.
The vampires thanked Little Garden for letting them bathe in the sun.
They spontaneously formed a guard, attacked Demon Lords everywhere, and maintained the stability of Little Garden.
Because of this feat, the vampires were called the "Knights of Little Garden".
The girl named Leticia was a member of the royal family among vampires.
But unfortunately.
After they made a name for themselves, the upper levels of Little Garden specially created an additional Sun Sovereignty in order to reward the contribution of the Vampire clan.
Namely, the Ophiuchus Sun Sovereignty, as a reward for their exploits.
However, a faction of the vampires who hated the sun, after learning the news, launched a rebellion.
Leticia, who returned from an expedition, found that her kin had been slaughtered.
The deep hatred and a certain opportunity made her choose to transform into a Demon Lord and smash her enemies to pieces.
Since she became a Demon Lord, she naturally became the object of crusades.
However, in order to defeat a Demon Lord, one must first crack the Demon Lord's Gift Game.
No one had done this for a long time.
Only Canary interrupted Leticia's Demon Lord Game and recruited her as a companion.
Therefore, Leticia was active in [Arcadia] for quite some time.
Until Takumi arrived.
The situation changed.
As mentioned earlier, Canary only used a trick to make Leticia her partner.
She did not actually crack Leticia's Demon Lord Gift Game.
Therefore, Leticia could not really be regarded as a full member of [Arcadia].
After Takumi came, with his own wisdom and strength, plus the information obtained from the original work, he easily cracked Leticia's Demon Lord trial and defeated the Demon Lord.
And according to the rules of Little Garden.
The defeated Demon Lord becomes the property of the successful challenger.
As a result, the pure blond vampire girl became Takumi's property.
At Takumi's request, Leticia willingly became his exclusive maid.
However, because of her previous experience, she still maintained a certain degree of contact with her [Arcadia] companions.
Of course, this was also with Takumi's tacit approval.
A few days ago.
Canary received a request to defeat a Demon Lord.
Because the enemy was a bit tricky, and [Arcadia]'s combat personnel, Kasukabe Takaaki and the others, were away, she found Takumi.
She wanted to ask him to borrow Leticia for a while.
After Canary paid enough, Takumi readily agreed to the request.
Don't look at Leticia as just a maid.
After completely unlocking the Demon Lord Game, her strength was considered top-notch among the 4-Digit beings.
Dealing with ordinary Demon Lords was a piece of cake for her.
Calculating by time, they should be subjugating the Demon Lord right now.
Why did Canary come back at this time?
Facing Takumi's question, Canary's expression looked a little depressed.
"This time the Demon Lord is a little trickier than I thought."
"Leticia is now protecting the client, so she can't return for the time being."
Hearing this, Takumi became interested.
"Oh? With your wisdom and Leticia's strength, you still find it difficult?"
He asked in surprise.
"Even in the face of the Strongest Species, it shouldn't be like this."
"Is it possible that you provoked a 4-Digit anomaly? Or a 3-Digit Demon Lord?"
Hearing this, Canary quickly waved her hand.
"How is that possible? If that were the case, I wouldn't let Leticia stay there."
"This time the opponent is not that strong, but their ability is too disgusting."
"Of course, its existence itself is disgusting!"
When she said this, Canary showed a very obvious expression of disgust.
It was very rare to see such a strong emotion on the face of this vixen.
"What happened?"
Takumi asked curiously.
"Maxwell's Demon from physics, you know it?"
Canary asked suddenly.
"You mean the imaginary mechanism envisaged by physicist Maxwell that violates the second law of thermodynamics, right?"
Takumi nodded.
The second law of thermodynamics is also known as the Law of Entropy Increase.
There are various expressions, but in a word, it is the physical law that denies the existence of perpetual motion machines of the second kind.
The corresponding Maxwell's Demon is a theoretical device that can detect and control the motion of a single molecule.
It acts as a gatekeeper that detects the speed of molecular motion and selectively lets them pass through.
Simply put, if there is warm water in a container, with a Maxwell's Demon device in the middle, the Maxwell's Demon sends faster water molecules through a valve to one side, while keeping the slower water molecules on the other.
Because temperature is determined by the average kinetic energy of the molecules.
In this way, the warm water can be separated into half cold water and half hot water without consuming any external energy.
If this concept holds true, under certain conditions, it would allow the infinite cycle of energy without loss, forming a perpetual motion machine of the second kind.
"That's right."
Canary nodded.
"The Demon Lord that needs to be subjugated this time is Maxwell's Demon."