Stepping into the spatial rift, the scene in front of him changed from a small room in the top of the dragon's spine tavern to a gloomy room. The faint candlelight around the surroundings only provides the most basic light for the guests here, but fortunately, the guests and the hosts here can see clearly in the dark.

"Welcome back, Master Cheese. A low, slightly distorted voice rang out, and a blue creature dressed in a butler's uniform stood on the side of the room. Its bloated body made the butler suit look a little ridiculous.

"Ah Fu, help me prepare the bathroom, and then go and inform Lily that I am going to visit her later. As he spoke, Cheese took off his wide gray robe and handed it to the blue creature beside him. The smile he wore on the top of the dragon's spine was no longer visible at this time.

"Okay, young master. The blue creature replied, a few moments of dark blue light flashing on its body.

"Miss Ann Lina has gotten up, and she accepts your visit. And I'd love to hear from you on this trip. ”

"Got it. Cheese said, pushing open the door to the room.

It wasn't visible in the room before, but the place where Cheese came turned out to be a huge tower, with a hollow center in the middle of the tower, and a spiral staircase attached to the hollow part of the center, and rooms were distributed next to the stairs. The height of the tower should be staggering, because from the position of the cheese, the bottom floor cannot be seen downwards, and only the white light source can be seen from the sky upwards.

Cheese walked towards the upper level of the tower, and the blue creature known as Ah Fu followed him three steps steadily.

"By the way, is there any news from the teacher?" asked Cheese.

"It's a pity, young master, there is still no news from the master. Ah Fu replied.

"Ah, forget it. Cheese said, standing in front of a door, "I'll go over by myself later, you go and prepare the lab first." In vivo testing may be required in the near future. ”

"Yes, young master. Ah Fu watched Cheese close the bathroom door and turned to walk down the tower.

............

"Senpai, Cheese is here to visit. Standing in front of a two-man tall oak door, Cheese knocked on the door in his freshly changed clothes and shouted.

And after he finished shouting these words, the two heavy doors slowly opened, revealing the dark space inside. Cheese shook his head, his own senior sister has always been very big, although this is not a big problem, but he still thinks that people who study knowledge should strive for simplicity and efficiency. With this in mind, he stepped into the darkness behind the door, and as he walked about ten steps from the door, two rows of candles lit up on either side of the wall, illuminating the three-man wide corridor. At the end of the road is a brick wall that blocks the road and has to be bypassed on both sides. This method of design is said to have been brought back from the Far East by the owner, the cheese teacher. Bypassing the shadow wall, Cheese finally saw who he had come to visit.

A large wooden table, with a nearby fireplace, is a blonde girl reading a book by the firelight. It seemed to be a quiet scene, but Cheese knew that the blonde girl in front of him didn't need any light source at all to see the words in the book in front of her, and all the decoration here was just because of the interest of the owner.

"Sister Lily, I'm here. Cheese walked over to the girl and pulled up a chair and sat down.

"Hee-hee, my sweet little cheese is finally back!" the girl closed the book as Cheese approached, and as she looked up, her bright red eyes stood out.

"Senior sister, didn't we say don't call me so numb, I'm eighteen years old!" Cheese looked helpless, but he couldn't do anything, after all, this senior sister grew up watching him grow up.

"My little cheese has grown up, don't you want my senior sister to call me? As she spoke, the girl made a sullen expression.

"Ahhhh

"Okay, I'm not going to tease you. Say, it's going to make you turn back in the middle of an adult mission and ask for help, what's the problem?

Cheese with a black thread decides to ignore his senior's title at the end of the sentence and begins to elaborate on his own problem.

"Today, I crossed the Dragon's Back Mountain. ”

In a word, An Lina, who was chattering before, instantly quieted down. The expression on his face also became serious and serious. In fact, when the girl is serious, the sense of calm in her body makes it difficult to associate it with her appearance.

"The Frost Man entertained me. And, I found this in their town. Cheese said, holding out his left hand, and a thumb-sized ball of green light began to condense from his palm.

"This trace of magic...... It's the plague. A plague of magic. An Lina stared at the ball of light for a few seconds and said.

Cheese nodded, closed his palms, and the ball of light dissipated.

"Can you tell what the plague is?"

An Lina frowned and thought about it, and said.

"No, I can't determine the type of plague based on the traces of magic alone. At the very least, give me a confirmed living case of the disease. ”

"Really...... So, can you roughly guess how it spreads?"

The blonde girl thought about it again, but shook her head.

"No, the gap between the magic plague and the ordinary plague is too big, and some magic plagues can even be transmitted through words, and it is difficult for me to draw any conclusions without samples. ”

Cheese frowned as well.

"Yes, you can't even specialize in disease?"

"Unfortunately, that's what happened. So it looks like your trial has begun. Ann Lina said with a smile.

"Live samples? I see. Cheese looked down and thought about it.

At this moment, Ah Fu's figure came in from outside the house.

"Master Cheese, Miss Ann Lina, good night. Young Master, the laboratory you arranged is ready, are you going to use it now?" said the inhuman butler.

"You don't have to, help me seal it, I'm afraid it will take two days to use it. Cheese replied, standing up as he could.

"Senior sister, then I won't bother too much, it will be very troublesome if those villagers find out that I am missing. ”

"Okay, okay, little cheese has grown up, and he doesn't have time to accompany his senior sister. Luckily, I still have books to read. An Lina puffed out her mouth, reopened the book on the table, and stood the table.

For this senior sister, Cheese can only smile bitterly, after all, although the relationship between the two is theoretically classmates, but for Cheese, this senior sister is more like a mother.

"Alright, I'll solve this adult quest as soon as possible. I'll also bring special products back to my senior sister. Cheese said.

And An Lina just snorted lightly and didn't say anything, and her dissatisfaction was overflowing. In this regard, Cheese had no choice but to shrug his shoulders and leave An Lina's room with Ah Fu. The master and servant quickly returned to the room where Cheese had been transferred, and the portal to the top of the dragon's spine opened silently on the obsidian pedestal in the center of the room.

Cheese thought for a moment, picked up a new gray robe from Ah Fu's hand, and draped it on his body.

"Young master, although I shouldn't have said it. Ah Fu spoke suddenly, causing Cheese to stop stepping into the portal.

"But I think you should spend more time with Miss Ann Lina, who is only more affectionate when she is with you. ”

Listening to the butler's words, the corners of Cheese's mouth once again flashed a wry smile.

"Emotional indifference is actually the norm for senior sisters, after all, she is a high-level blood clan. Loneliness and apathy were almost carved into her bones. It's unusual that she's so enthusiastic about me like she is now, isn't it?"

"Yes, it's the subordinates who are talkative. Ah Fu lowered his head and said, if the blue mass sticking out of his collar was really his head.

"Forget it...... You're not wrong. I'll go back first, and if there's any news from the teacher, you know how to inform me. Cheese said, stepping into the portal. And as he entered, the spatial rift gradually healed, until it finally disappeared. The little lighting in the dimly lit room was also turned off due to the disappearance of its occupants, plunging it into pure darkness.

Re-entering the room in the Tavern at the Top of Dragon's Back, Cheese looked out the window at the still dark sky, stretched his waist, and snapped his fingers lightly, and the runes attached to the doors and windows dissipated like floating dust, and no one could tell that a portal had just been opened here.

"Anyway, let's get some sleep. Cheese muttered.