Practical teaching: Starting from the soul traveling through Dragon Garden

Chapter 424 Extra: Theory of Love with Divergent Values
Horikita, who went to college, is still that tsundere little girl. Although she wants to dominate Ryuuen all the time, Suzune won't express it directly. Her way of expression is somewhat special.

……

In front of the Yasuda Auditorium at the University of Tokyo during the rainy season, Horikita Suzune's knuckles turned white as she gripped the handle of her umbrella. Rainwater slid down the spine of her Econometrics book and formed a small vortex at her feet. She counted the twelfth footsteps that passed by the literature department's corridor bridge - three light steps and one heavy step, and the third step would definitely hit the loose wooden floor - and sure enough, at 17:06, the familiar tip of the shoe came into view.

"Hey, Lingyin, have you finished collecting data for today?"

Ryuen Sho's umbrella was tilted over to cover the water marks on her left shoulder, and the scent of moss mixed with the incense of the copy of "Tsuregusa" in his backpack.

"Do you need me to provide the consumption frequency of curry bread in the third cafeteria this week?"

Suzune turned her face away to hide her smile, but a half piece of Japanese paper was exposed on the edge of her economics notebook - it was the imitation of the Shinkokinshu that Ryuen had stuffed into her mailbox last week:
“The plum rain curtains / In the backlight of the calculator / Your eyelashes are counted to the seventh.”

As for why Long Yuan provided his own consumption frequency, it was naturally to cooperate with Ling Yin's research.

Still remembering that time, Lingyin was staying up late to derive a regression model. She looked up and saw her eyelashes in the mirror fluttering like butterfly wings in the blue light of the screen. Ryuen suddenly took away the "Advanced Microeconomics" that was under her elbow. On the inside of the title page was a convenience store receipt - "Crab salad sandwich × 1, black coffee × 1", which was exactly the combination that Ryuen used when he wrote his thesis all night.

"Longyuan!"

Horikita's ears turned red as she took back the textbook:

"It is an infringement to rummage through other people's belongings without permission."

"Infringement?"

Ryuen smiled and unfolded the draft paper she had folded into a paper crane, revealing the densely packed calculation process on the back. What she derived using the Cobb-Douglas function was: "The probability distribution of the frequency of Ryuen Xiang from the Literature Department passing by the corridor of the Economics Department."

"Lingyin, you studied economics, right? Does this have anything to do with economics?"

Horikita pushed up her black glasses. They were bought for her by Ryuuen last time they were on a date. When she first got them, Suzune disliked them, but now she wears them whenever she does her homework.

"Of course there is. You are a literature student so naturally you won't understand."

Ryuuen's fingertips traced over the nicknames that Lingyin had given to the case characters. The payment matrix of "Literature Club L-kun" clearly read "Bento Exchange Utility +∞", while the strategy column of "Economics S-san" was filled with "The optimal path to pretend to meet by chance."

Although Ryuen had long known that his frequent encounters with Suzune were not just coincidences, he had never expected that Suzune had found the optimal solution for encounters in this way. Was Suzune studying Ryuen? She seemed to have had this tendency since high school.

Horikita was a little shy about the exposure of what she wrote, but she still pretended to be calm and took out two lunch boxes from her canvas bag like a magician. The rice balls made by Horikita herself were lying in the lacquerware with the stone image of Natsume Sogo. And the sandwich wrapped in "Das Kapital" in her bag clearly contained the mentaiko that Ryuen loved to eat.

Horikita wanted to shut Ryuen up with food. After going to college, Ryuen didn't ask Horikita to cook for him (other girls would also fight to cook, and in order to treat them equally and not waste food, Ryuen decided to eat in the cafeteria by himself), so Ryuen would go to the cafeteria to eat, but Horikita would occasionally prepare a lunch box for him.

The two of them were doing their homework together, and Long Yuan also had his own homework to deal with.

Horikita's mug was pressing down on the "Oshu Trail" that Ryuen was annotating, and the circular water stain on the bottom of the mug just circled the four words "Dew Water Fate".

Suzune's right hand, which was holding a pencil, was suddenly attacked by lemon candy baked by Ryuuen's body temperature. Recently, in order to cope with homework, Suzune has had some hypoglycemia, so Ryuuen always prepares some candies on him.

At the moment when the sugar exploded on the tip of Suzune's tongue, Ryuen wanted to borrow a pen from Suzune's pen bag because his pen was out of ink. However, he found Suzune's note lying in the pen bag: "Reasons for the rightward shift of the demand curve: ① The curry bread is sold out ② Someone said that a button on his shirt opened today."

Ryuen placed the capped end of a black pen against Suzune's chin. "You're studying me like this, are you trying to murder your husband?"

Without a doubt, Ryuen received a roll of the eyes from Suzune. "Yeah, aren't you afraid? If you don't agree, you can study me."

Suzune also tried to press her pen against Ryuuen's chin, but she forgot that she was using the tip of the pen, and naturally left a black mark on Ryuuen's neck.

The moment Lingyin made her move, Ryuen had already anticipated this result, but the reason he didn't dodge was that he also wanted to give Lingyin a black line.

Ryuuen smiled and held Lingyin's hand, and used the pen in her hand to draw a line on her own neck.

"That evens it out now."

I don't know if it's Suzune who is childish or Ryuuen, but when they are apart, they both look like mature adults, but when they are together, they become like a pair of elementary school students fighting each other.

"I'll clean it for you."

Ryuuen put down the pen in his hand. Instead of looking for a wet tissue to wipe Suzune's neck, he just hugged Suzune and drew circles on her neck with his tongue.

"No, no, the homework is not finished yet."

Although she said no, Suzune hugged Ryuen's head. Ryuen really stopped and looked at her. Suzune got angry and bit Ryuen's neck: "The professor will forgive me."

After saying that, Lingyin's eyes were a little evasive, like a child who had done something bad. Since Lingyin said so, of course neither of them finished their homework.

Of course, after that night, Ryuen also did some research on Suzune. For example, what Ryuen once calculated with chalk in the corner of the blackboard was not the frequency of occurrence of seasonal words in the Manyoshu, but the "correlation analysis between the number of times Horikita Suzune smiled and the duration of sunshine."

Perhaps this is the unique interest of the two of them, and both of them never get tired of it.

On the rooftop of Building No. 4, Horikita was about to read out the "Protest Letter Regarding Ryuen Sho's Excessive Interference with Research Progress", but the A paper he unfolded was soaked by the rain, revealing hidden words - a haiku that Ryuen had written in advance with lemon juice: "On the back of the protest letter/the cicada is calculating/the summer solstice line where we kiss."

When students of the Faculty of Economics were discussing the "loopholes in the rational person hypothesis," Horikita added a note on the title page of Ryuen's damaged History of Japanese Literature: "A perfectly competitive market does not exist, just as I can never maintain diminishing marginal utility in front of you."

On the back cover of Long Yuan's latest term paper, the supply curve and demand curve drawn in pen are tightly intertwined outside the coordinate system, and the title reads:

"Super Long-Term Equilibrium: On Inelastic Dependence in the Dating Market"

It was another ordinary day. When the morning light penetrated the blinds of the Economics Department, Ryuen and Suzune were sharing a pair of headphones. In the left ear, the analysis of rakugo from The Tale of the Heike was playing, and in the right ear, an English lecture on Monetary Policy was playing. On the notebooks spread between their knees, pencil and pen writings were fighting each other:

"According to yesterday's observation, someone peeked at me more frequently than the Walrasian equilibrium—"

"I suggest you refer to the data from the day before yesterday, which showed the Pareto optimality of a certain top student's tachycardia when he was adjusting my collar."

The rain fell again, drawing countless intersecting spider webs on the window glass.

The little love stories of the two are updated every day.
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Couple's daily code book:
1. Double Encrypted Love Letter -
Horikita wrote the bento menu as a Slutsky equation -
Ryuen hides the appointment reminder in the variant pseudonym of "Hojoki"

2. Reverse love game -
Deliberately taking the other party's textbook by mistake and inserting hand-drawn key points -
Using revision mode in a shared cloud document to argue about "who fell in love first"

3. Feeding of subject private goods
Horikita used STATA software to analyze the word frequency of Ryuen's poetry collection
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Ryuen tampered with the consumer surplus theory into the "Ring Sound Surplus Theorem"

4. Observer Paradox Practice
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Horikita's "Ryuen Sho Irrational Behavior Log" is hidden in the password disk of the mobile phone
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Ryuen's "Horikita Suzune Micro-Expression Chart" disguised as a haiku seasonal notebook
……
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(End of this chapter)