Preface Episode 1. "Poolside"

Ginrei is standing by the poolside of a public swimming pool. She is an instructor at a swimming school here. She is 172cm tall. Her black swimming costume clung to her toned body, which she had trained in swimming. On top of that body is a pretty face that doesn't look like that. The lips are a little thick and a little pale. Her hair under her swimming cap is cut short. There were many beaten boards piled up at her feet.

Today she is going to teach the children how to use the beaten boards for flutter kick  practice. Ginrei waited for the children as they did their preparatory exercises.

"I'll do my best to help them improve quickly," she said.

She had a dog when she was a child and was very affectionate with it, but now she loved children, who, despite being different species, were both innocent and pure. As she was smiling at the sight of the children swimming in the pool, Kimura, a fellow instructor, spoke to her.

"They're late today, aren't they?"

Kimura is a well-built man, nearly six feet tall, with tanned, brown skin that looks healthy after a summer in the sea.

"Yes,"

She says.

" I wonder if they've had a long lesson?"

"They're so naughty, someone's playing a prank in class and the teacher's squeezing them.Hmm. I'm afraid so."

"Sir!"

As Kimura and Ginrei were chatting, about twenty childrens came in. They were all in their early primary schools years.

The children lined up, poking each other and cackling.

"Today we're going to do some flutter kick  exercises on the beaten track. Is everyone ready?"

"Yes!"

Ginrei handed out beaten boards one by one to the childrens.

"First, hold the end of the board like this and move your legs back and forth alternately. Do you understand?"

As Ginrei was explaining to the children.

"Hey!　　What?　　This is a swimming pool, you can't enter without changing into a swimming costume!"

Kimura, who was standing some distance away, shouted towards the entrance. A young man had just walked in. He was wearing loose denim trousers and a black hoodie with a hood up. The man ran silently towards the children. His eyes were bloodshot. Kimura runs to stop him, but the man narrowly slips past him. He pulled out a knife from his pocket. Ginrei stood between the children and the man as quickly as she could.

"Stop it!"

"Shut up!　　You bitch!

The man shouted and jumped on Ginrei. The children screamed. The teeth of the knife, shining with a dull light, plunged into Ginrei's stomach. She grunted and folded her body to protect her stomach. The man continued to stab her, not in the stomach, but in the thigh. Ginrei collapsed on the spot.

"Son of a bitch."

Kimura, who had come running, pinned the man down from behind.

"Somebody!　　Call the police and emergency services!"

Fresh blood spread across the poolside.