In the silence of the night, Yoh and his friends embarked on an adventure to find UFOs with their love and curiosity for supernatural phenomena.They chose to camp and wait for the unknown light and shadow on the mountains far away from the hustle and bustle of the city.Huang Tian paid off his hard work. After two days of patient waiting and praying, they finally captured the mysterious unknown light and shadow in the sky and submitted a satisfactory answer to their class group report.

However, Yoh's daily life is also full of wonderful encounters.He liked to order a bowl of hot pig blood soup from a vendor near his dormitory. That day, he met a customer with strange behavior - Pun.Pun always orders a big bowl of pig blood soup and always holds two umbrellas while eating. These unusual behaviors aroused Yoh's curiosity.Through his familiar little sister Kaemsai, Yoh learned Pun's name and discovered that Pun had become the vendor's VVIP because of his frequent visits.Yoh didn't want to lose to this “weird”, so he ordered more pig blood soup, and even had to take it away even if he couldn't finish it.

Pun's strange behavior inspired Yoh's desire to explore, and he decided to investigate Pun as an observation object.By chance, Yoh and his friends met Pun again at a street vendor.The girls who were initially hesitant about Yoh's plan were deeply impressed after seeing Pun's appearance and temperament.This makes Chalui, the only male member of the group, feel a little helpless.

Yoh's interest in Pun became more and more intense, and he began to peek at Pun at the vendors, intentionally or unintentionally.Once, Pun noticed Yoh's behavior. He walked up to greet Yoh and expressed his interest in the same pig blood soup.When saying goodbye, Pun even patted the back of Yoh's hand gently and praised him for smelling good.This move made Yoh feel strange and at the same time inexplicably familiar.

This sense of familiarity drove Yoh to approach Pun.When Yoh learned that the dormitory in the building where Pun lived was for rent, he rented the vacant room diagonally opposite to Pun without hesitation.His group members were excited, and although Chalui had some objections to using Pun as a research subject, he eventually compromised.

Soon, Pun discovered that Yoh had moved to the haunted house diagonally opposite.The two began to meet frequently at the stall because of their mutual love of pig blood soup.During a Valentine's Day half-price dining event, Pun actually grabbed Yoh's hand to announce their relationship in order to save money.Afterwards, Pun explained that he had no other intention and simply wanted to reduce daily expenses.

However, when Yoh and Pun were talking on the rooftop, Pun suddenly asked Yoh's purpose.In Yoh's flashing eyes and hesitant words, Pun noticed that Yoh seemed to have met him many years ago.Pun revealed that he was no ordinary person and then disappeared without a trace.

Yoh was confused and worried about Pun's sudden disappearance.He came to Pun's dormitory door and knocked, but found that the door was unlocked.He walked into the room curiously, but was surprised to find a coffin on the floor.This immediately reminded Yoh of the legend of vampires, and his danger was approaching...