MTL English: The story centers around Kanna and Riko. As you know, Riko has a strong unrequited love for her friend Kanna and dreams of marrying her someday. Riko recalls a time when, after school, the two girls were on their way home and Riko invited Kanna to her house for some intimate activity. Kanna is completely unaware of Riko's strong feelings for her, but considers Riko a good friend. Meanwhile, Riko is desperately trying to win Kanna's heart. As she happily runs along, determined to win Kanna's heart, she unexpectedly encounters a stranger, Lucoa. Lucoa is a large, mature woman with breasts the size of watermelons. Lucoa asks Riko for help with something, saying it will only take a minute, and that if Riko accompanies her to the alley, she will give her cash as a reward.
Riko, being innocent, agrees to Lucoa's request. She thought that with the money, she might be able to buy Kanna some chocolate. Riko had no idea what Lucoa's plan was. Lucoa quickly reveals her intentions and rapes Riko in an alley where no one can hear her screams or cries for help. An hour later, after finishing sex with Riko, Lucoa takes a picture of Riko, covered in vaginal fluid and saliva and looking deeply depressed, on her cell phone. She uses the picture to blackmail Riko and force her to have more sex in the future. The next day, Kanna goes to class but notices that her friend Riko is missing. Kanna becomes anxious, wondering where her friend could have gone.
During break time, Kanna decides to sneak out of the schoolyard to look for her friend Riko. She finds Riko with disheveled hair and looking distressed, and asks her why she didn't attend morning class. Riko is surprised to see Kanna and makes a series of incoherent excuses. Not wanting to involve Kanna or hurt her, Riko leaves. Kanna follows her, wanting to know what her friend Riko is thinking. Finally, the two arrive at Lucoa's house. Riko had been lured by Lucoa via email, using a threatening photo taken the day before. Lucoa, surprised that Riko had brought friends, invited them into her home.
As the three sat on the sofa, Riko was filled with tension and anxiety. Her best friend, Kanna, joined them, and no one could predict what Lucoa would do. To everyone's surprise, Lucoa handed them microphones and told them they could enjoy singing at her karaoke. Riko reluctantly agreed, just like Kanna, though Kanna didn't know who Lucoa was yet. However, she suspected she was an older friend of Riko's. After they finished singing, Lucoa began touching Kanna's leg. Riko noticed and realized Kanna was also in danger, but she felt powerless to do anything. Soon, Lucoa began kissing Kanna passionately, their tongues intertwining, and copious amounts of saliva dripping from their mouths. Riko was shaken to see her beloved Kanna being kissed by someone else.
Finally, Riko can no longer bear it and desperately tries to pull Lucoa away from her friend Kanna, but Lucoa suddenly starts kissing Riko as well, repeating a sticky, saliva-soaked kiss. The two girls stare at Lucoa, stunned and trembling with fear. Lucoa licks her lips, preparing to have sex with them. The three girls enjoy hours of hot, sticky, and intense sex, orchestrated by Lucoa. Kanna and Riko, who were supposed to become a couple, have their first kiss and virginity stolen by an older stranger.
Afterward, the three girls lie exhausted in bed, having had hours of sex, when Lucoa sprays vaginal fluid and breast milk on the two girls, bringing the experience to a climax. Meanwhile, at the Kobayashi house, while Kobayashi is playing the game "Guilty Gear," she encounters a character named Jack-o'-Valentine. Jack-o'-Valentine strikes strange but alluring poses. Kobayashi learns that this is a trend called the "Jack-o'-Challenge." To pass the time, Kobayashi suddenly decides to try the Jack-o' pose. After a few minutes, she manages to pull it off, but quickly gets tired. When Thor enters the room, he is surprised to see his mentor Kobayashi in the alluring and provocative pose, and immediately mistakes it for an invitation to sex. He strips naked, thrusts his buttocks up, and rubs his vagina against the clothed Kobayashi's vagina.