“Wow… It’s surprisingly spacious.”

Yuzuru muttered as he finished changing into his swimsuit ahead of time and looked around the indoor pool.

There are four types of pools.

Kids pool for children.

Walking pool for exercise.

A Jacuzzi pool with bubbles spouting out.

And a twenty-five-meter pool for swimming.

The bathrooms and sauna are located next to the indoor pool area and are directly connected to it.

“Sorry to keep you waiting, Yuzuru-san.”

A voice called out from behind him.

He turned around and saw Arisa standing there, having finished changing her clothes.

“…no, I just walked in.”

As he said this, Yuzuru looked closely at Arisa’s swimsuit.

She was wearing a swimming suit, not a bikini because she was going to be taught how to swim and it was at a health spa…

It was a very simple and common swimming suit, made of black fabric with red lines.

There was nothing strange about using it for school classes, or perhaps it was the swimsuit that she planned to use for school.

(They say a beauty looks good no matter what she wears…)

The swimsuit clung perfectly to Arisa’s skin, revealing her wonderful proportions.

Her chest was round and full, while her stomach was tight and firm.

Her lower abdomen was a bit exposed and a bit revealing, but her long, slender legs were beautiful.

Yuzuru felt a healthy sense of sex appeal.

“…Yuzuru-san. What are you staring at?”

On the other hand, perhaps noticing Yuzuru’s gaze…

Arisa stared at Yuzuru with a fierce glare.

“N-no, sorry.”

Yuzuru apologized, thinking for a moment before adding.

“I was admiring you.”

“…I see.”

Arisa looked away and replied in a tone of no concern.

But her face seemed to be blushing a little.

“Let’s go quickly.”

With a little bounce in her voice, Arisa began to walk briskly.

Yuzuru followed after her.

(…Her back is beautiful too.)

Her back, visible through the boldly opened backside, perhaps to reduce the resistance of the water, was very beautiful.

Looking down a little, the shape of her buttocks stood out clearly.

Well, naturally Arisa, who does not have eyes on her back, did not notice Yuzuru’s gaze.

She went into the water with a “splash”.

Yuzuru followed suit.

“…So, what should we do?”

“Hmm…”

Yuzuru thought for a while before answering.

“For now, I want to see what level you’re at, so swim for me.”

“…eh?”

Arisa gave a troubled look at Yuzuru’s words.

“I’ll drown.”

“…Your feet can reach the floor, right?”

“People can drown in water as little as 30 centimeters deep.”

It’s certainly not without its dangers.

But it is impossible to judge without actually seeing it.

“I’ll definitely help you.”

“…Then, if I can’t get up after ten seconds, please help me.”

She then took a deep breath and sank into the water.

Then she started moving her arms and legs vigorously.

“…”

She looked like a bug that had fallen into a lake.

Fortunately, she did not drown.

After ten seconds, Arisa stood up.

And then, slowly, as if appealing to Yuzuru, she said.

“I can’t float.”

Apparently, it was necessary to start by floating properly in the water.

This was quite a serious problem.

“Could you try floating without moving your arms and legs…?”

“…I won’t float.”

“If you drown, I’ll save you.”

“…you have to, okay?”

As she said that, Arisa kicked the floor of the pool.

Then she straightened her arms, legs, and back…

And sank soundlessly into the water.

After a while, Arisa stood up.

For some reason, she had a pouting expression on her face.

Yuzuru couldn’t help but chuckle.

“Well, now I understand the reason.”

“…Are you sure?”

Arisa looked at him suspiciously.

She apparently couldn’t believe it.

“Are you going to tell me it’s because I’m not putting enough power? …I don’t think the mass or volume of my body will change just because I exert more power.”

Apparently, she had received such instruction in the past.

But the results were, as can be seen, useless.

“I’ll try to teach as theoretically and practically as possible, not just by intuition.”

At Yuzuru’s words, Arisa gave a small nod with a look of doubt on her face.