"The first thing we had to work on was the biodegradability."

"Oh."

is the property of a material to decompose into inorganic substances without emitting harmful substances after disposal.

Many plastics remain in the soil and water for a long time without decomposing, causing environmental pollution.

Saki has learned about the story of Jin's former home on Earth, and has worked hard to make it have these properties.

"<> are plastic. They do not deteriorate as long as they are supplied with magic power.

Saki explained that when the supply of magic power is cut off and the magic contained in them dissipates, they begin to deteriorate.

"Isn't that great?"

"Hehehe, I can't lose to Hannah-chan.

Saki continued her explanation.

"The reason why Magi metals and alloys are so strong is because the magical isotopes (Magi isotopes) in them react with free magical elements (ether) to increase their strength, and you wanted to do the same thing with resin.

"I can understand that."

Jin had guessed that much.

The biggest problem was what to do about the molecular structure of plastic.

When I mentioned this to him, he said,

"Yes, I honestly decided that <>. So I checked out <> book. In the end, I asked Marikka to help me and talked to Mr. 700672.

Saki replied with a smile.

"So ...... you went through a lot of trouble."

"No, no, I'm doing what I love, so I don't think it's hard work, but I don't think it's painful!"

Saki is positive to the last.

"So I did some research. I found the molecular structure, but there is no way I can reproduce the whole thing. Besides, we don't want to emit toxic gases when we burn it.

"Yeah."

Saki had a firm idea.

"So, polyethylene, polypropylene, polystyrene, polycarbonate, polyacetal, and polyethylene terephthalate were the candidates. I could say ...... like that without chewing."

Saki smiled as she said all the difficult names at once,

"I don't fully understand it either.

She stuck out her tongue.

"So you chose a plastic made only of carbon and hydrogen," he said.

"I can understand that."

Jin was aware that plastics containing sulfur, nitrogen, chlorine, etc., could produce toxic gases and pollute the environment, depending on how they were burned.

Saki really gave priority to environmental concerns.

"So, among the candidates I just mentioned, I selected those that could be reproduced by engineering magic," he says, "polyethylene, polypropylene, and polyacetal. These were the limits."

In fact, the other plastics were complicated by a structure called a benzene ring.

"No, it's still amazing!"

Jin was honestly impressed.

"One unfortunate thing is that all of them are not very transparent.

Saki looked frustrated as she said, "They can't be used for windows.

"But I'm sure we can work on that in the future."

Jin followed Saki's lead, "It's not like there aren't other transparent materials out there.

"Yeah, ......, I guess so. From now on!"

Once again, Jin looked at the three types of Maggi plastics that Saki had developed.

Maggi Polyethylene. Jin was one step away from developing it, but Saki had done an excellent job.

Magi Polypropylene. It is harder than polyethylene and can be used in different ways.

Magi polyacetal. The strongest of the three.

"My guess is that it will be ruined in about 10 to 20 years under normal use."

"I guess so."

The plastics Jin knows are similar in terms of durability.

"But it can also be burned, and with the <>, it can be broken down into carbon, hydrogen, and oxygen!

"That's amazing."

Saki's hard work and efforts were evident.

"So, what did you do with the raw materials?"

Jin was also at a loss.

"Kuhuh, it's ethenol!

"I see!

<

It should contain large amounts of the magical isotopes (magiisotopes) of hydrogen H2 and oxygen O2.

"I didn't have much trouble finding C."

The magical isotope of carbon (maggi-isotope) is found in many things.

For example, it is found in the flesh and skin of demons. It is also found in magic resins.

What would Jin make with this?

A baby bottle, I guess.

"What?"

Saki's eyes rolled back in her head at the unexpected word.

"There are more babies in the village of Kaina, and there must be a demand for them in the world."

"Hmmm, a baby bottle, then. I wonder if Jin has become a little more self-aware now that he has a family.

Saki smiled mischievously and patted Jin on the shoulder.

"Aware?"

"...... Oh, dear. Jin will eventually become a father too.

"Oh, I see what you mean."

Jin blushed when Saki interrupted him.

"Thanks anyway, Saki."

"Kuh, for Jin's sake, but I hope it's for the world's sake too!"

"Yeah, I guess so."

Jin's face broke into a smile when he saw Saki smiling so radiantly.

* * * * * *

"So, what are you doing, Jin?"

Jin and Saki were talking over Citran juice in the institute's cafeteria.

"Oh, I don't know if there's a mess with Hale or not, but I'm going to focus on the points to reflect on from the last battle with ."

"Reflections?"

"Yes. I realized that I didn't have a decisive move against a huge opponent."

"Yeah, that's true."

Saki was with me in Adriana, so I know what you mean.

"Well, what exactly?"

"Well, we need to make it possible to release <> with the Magi Transcription Cannon, and prepare a high power <>.

"It's not a very fun development."

Saki smiled as she saw the bitterness on Jin's face.

"Indeed. I can't wait to get out of this mess.

"I'll cooperate with you, even if it's not enough. Jin, good luck. For Erza's sake and for the sake of this planet.

"Of course I will."

Saki looked at Jin with narrowed eyes.