Cherver Manor is located on the shore of the Lake of Mist, this Western-style mansion with European medieval architecture is as famous in Gensokyo as its alchemist owner, not only because of the wealth in the manor that even the rich curse from the bottom of their hearts: "Damn alchemist." "What's more, this alchemist named Hisari has been assisting the Witch of Hakuree to solve the mutation since a hundred years ago, from the ninth generation of the shrine maiden to the present she can be said to be the "old minister of the Five Dynasties", although there are countless monsters in Gensokyo that are more than 100 years old, but there are not many who are so active in helping the witch solve the mutation, so most of the residents of Gensokyo have a good opinion of it.

On this day, Hisari was reading a book in the library, and a blonde magician rushed in through the window on a broomstick, and Hisali did not look up, but with a wave of her right hand, the magician was tied into a rice dumpling by vines.

"Now, Hisali, I'm coming to play with you!" Marisa jumped up and down to Hisari, the vines falling off one by one. Hissari held out a hand, and Marisa tilted her head in confusion, "What for?" ”

"Don't play dumb, don't think I don't know what you did last time." Hisali said with a blank expression.

"DA☆ZE!, I came to return the book last time!" Marisa scratched her head, and Hisali picked up a copy of the book and smashed it on her head.

"Return the book!"

"DA☆ZE ...... discovered" Marisa reluctantly pulls a book out of her clothes while covering her head, and Hisali continues to look at Marisa after putting it on the table.

"I just took a book DA☆ZE."

"......" Hisali didn't speak, stepped forward and took off Marisa's hat, and before the other party could react, she took out more than a dozen books from it.

"How do you know?"

"Your four-dimensional hat can be said to be known to everyone in Gensokyo, really, you changed it into a treasure and it was used to store books......

"Really, your lifespan is obviously unlimited, isn't it okay to wait until I die to get it?" Marisa said as she walked over to the bookshelf, when she was suddenly drawn to a sign, inconspicuous, on a book at the bottom of a shelf.

"What is this, Hisali?" Marisa pulls out the book.

"Ah, that's what I collected when I was out there,"

"But as far as I know, this sign has only appeared in the past hundred years, and not many people in Gensokyo know about it, but I took a book from Xianglin, and it talked about the meaning of this sign, Hisali, how can you have such a book." Marisa walked over with a serious face.

"Ha......" Hissari sighed, looked at Marisa, and said, "Marisa, do you know that sometimes it's not good to know too much?" ”

"Are you really?" Marisa suddenly took a few steps back with her broom.

"That's right, you guessed it right, I was indeed a Hydra man." Hisali stood up, a magic circle in her eyes, and Marisa walked to the window, only to see Fuster suddenly appear and close the window.

"MasterSpark (Extreme Spark)!" A magic cannon shatters the walls of the mansion, and Marisa flies out of the hole, and Hisali quickly chases after her.

“HailHydra！” Hisali looked at the other party with a fanatical expression on her face: "Marisa, if you want to blame it, why do you like stealing books so much, seeing this, I can't let you leave, MagicStorm!" ”

Incomparably violent magical energy poured into Marisa, and Hisali, who was already able to send out super magic, was naturally very strong, and just as Marisa was about to be swallowed by the storm, a voice sounded: "EX-SignBarrier!" "It was the succubus who saved Marisa.

"Master! Are you still alive? Marisa was a little surprised, and the succubus slapped her and said, "Stupid, how can I die so easily, it's just that I've been trapped under the manor and can't get out, and the place you just broke is just the corner of the circle that imprisoned me." ”

"Master is here, so don't be afraid of Hisari."

"No, I can't beat her now, let's go find Reimu!" The succubus pulls Marisa to the Hakurei Shrine, and Hisali pauses and smiles.

Reimu was also a little puzzled when she saw the succubus and Marisa in such a hurry.

"What are you doing...... Reimu could finish speaking, Marisa grabbed her arm, "Reimu, it's not good, Hisali is a Hydra!" ”

"Hydra ......" Reimu tilted her head and smiled weirdly, Marisa didn't notice this, and continued, "I know you don't get rid of Hydra, it's a very evil organization. ”

"......" Reimu picked up the coin, and Marisa instinctively sensed the danger and quickly pushed it far away and on guard.

"Now, Marisa, you've seen something you shouldn't have seen," Reimu said as she walked over to Marisa, her face as fanatical as she had been before and chanted, "HailHydra!" ”

Marisa was grabbed by the succubus and flew to a remote corner of the Yokai Mountain, and Marisa said in some surprise, "How can this be, how can Reimu and Hisali both belong to Hydra." The succubus was silent for a moment, then grabbed Marisa's arm and said, "Stupid apprentice, I want to say ......"

"I know that we want to keep the peace of Gensokyo, and we need to solve this ...... mutation," Marisa said with a resolute expression.

"I mean, HailHydra!" The succubus gave Marisa a creepy expression.

Nearby, two girls in pink clothes watched all this, and one of them said, "Can you attract attention by shooting like this?" ”

"Of course, the Red Devil Pavilion has been short of funds recently, but we value this commercial value so we don't hesitate to empty our funds to invest in this movie, but thanks to you, I know that there is such an interesting stalk in the outside world."

"But why am I here, I haven't entered Gensokyo yet."

"Since I summoned you to Gensokyo by coincidence, let's help my sister once, I have a bad asthma and can't lift heavy objects, and Remy and they have other tasks, so you can help me for a while, Nina." Pache said with a smile, and Nina said with some whims: "I didn't do anything good here. ”

"Isn't that all from a previous life? You're now Nina Norreki, not Nina Chalk. ”

"But Marisa, is that really okay? The succubus is her master, and it's heavy enough. ”

"Isn't it a pleasure, this black and white mouse has stolen a lot of books from me, Alice and Hisali." Pache said this, but she was going to step forward to stop the succubus.

"You're distressed." It was the succubus and Marisa who suddenly walked over and said.

"Not really!" Patchouli crouched down with a flushed face, and everyone laughed. Hakurei Shrine, Alice, Hisali and Reimu sat in a row, and Alice said with some unhappiness: "I actually let that purple bean sprout take the lead, Marisa is clearly mine!" Hisali playfully said, "You three are really happy enemies, anyway, I have Fore, Marisa will give it to you." "What do you mean to give it to us! Do you like Marisa too? Alice clenched her little fist and puffed out. You guess. Hisari had a mysterious expression, and Reimu looked at it a little speechless, "Fran, Kappa and the rest of you all like Marisa." "Do you feel threatened? Miss Reimu? Xuan Ye joked. What! Reimu blushed as well, and Hisali covered her mouth and smiled, and then looked at Fuster standing next to her, all without saying a word. Alice said a little strangely, "Can you show affection as if no one else is around, I know you won't rob Marisa, but don't put flashbangs in front of us singles." "What do you say, we're women." Hisali was also a little shy when she heard this. "What's wrong, the ratio of men and women in our Gensokyo is seriously imbalanced, the number of women exceeds that of men by several times, and the monsters are even more yin and yang, so it's not surprising that it has become a lily township." Reimu mended the knife on the side, and as soon as this remark came out, it immediately became cold.

A tengu flew in the sky: "The headline of this issue has been drafted!" It's called: When the illusion is gone, we are all hydras! ”