A day like any other or not!?! (1)

As every morning, Miyako knocked on Maron's apartment door, but the apartment remained silent. "Marron", Miyako almost shouted his heart out.
Then Marron woke up. She went to the door sleepily and opened it.
"Good morning," said Miyako in a happy voice. "Good morning Miyako," Marron replied loudly but with a tired voice. Then Marron quickly told her friend Miyako that she wanted to jump into the shower and she disappeared into the bathroom. She came back shortly afterwards, picked up her school supplies, and closed the door behind her. That's when they met Chiaki. They said hello and made their way to school. They met Yamato at the school gate. He had recently become Miyako's boyfriend. In greeting they hugged each other and gave each other a gentle kiss on the mouth. Maron and Chiaki thought at the same moment that it would be nice if they also had a partner.Marron thought of Chiaki and Chiaki thought of Marron. After that, they entered the school. This time passed in a flash. After their duty to go to school, the four decided to take a little walk in the park. Since it is more romantic there than in the fully sieged schoolyard, Miyako and Yamato were especially happy about it. Suddenly snowflakes flew from the sky. From one second to the next it was bitterly cold. Miyako snuggled up against her Yamato and he put his arm around her. Marron was a bit jealous and glanced at them accordingly. Then Marron felt an arm wrap around her shoulders. It was a pleasant warmth. It was Chiaki's arm that pressed her to him. Marron felt a comfortably warm feeling in her heart and she found it very pleasant. At first she didn't want to admit it, but she had to admit that she felt more than friendship for Chiaki. He often made hints that he liked her, but she doesn't believe him and when he got close to her she pushed him away.But there was also Sindbad. She felt the same with him as she did with Chiaki now. "Strange," thought Marron. Then Miyako tore her from her thoughts, because she showed Maron, a strange man who looked very hateful, and hit the edge of the well with his foot with full force. At that moment it beeped from Maron's pocket. She knew what that meant. She quickly said goodbye to Yamato, Miyako and Chiaki on the pretext that she still had something to do. She was gone by then. After Marron, Chiaki also disappeared under the same pretext. Miyako and Yamato found it a bit strange that the two always disappear at the same time, but they quickly dismissed the thoughts and turned to each other. They kept walking in the direction of the man. Miyako turned to Yamato and kissed him passionately. He returned the kiss as passionately as she had started it. Yamato raised his hand and gently brushed Miyako's cheek.At that moment a hand came towards Miyako, this hand wrapped around her neck. Another hand slapped Yamato, who fell to the floor and passed out immediately.

What will happen? What is happening to Miyako?
I'll give you this and other answers in the next part.