"Aligado. Pen, fun, pavilion www. biquge。 info" Zhu Zi hadn't heard the loss in Haruka Ayase's tone.

In January, almost all the focus was stolen by Zhu Zi, including the just-concluded Red and White Song Party, which also seemed to be stolen by him.

While people were paying attention to what Zhu Zi would do next, Zhu Zi had already led the fourteen members of AKB48 on a flight to Hokkaido.

This time their targets are Hakodate City and Lake Toya.

…………

Hakodate City is a coastal city located on the Kameda Peninsula in the southeast of the Toshima Peninsula in southern Hokkaido (Hokkaido), and is also the central city of Hokkaido. It is surrounded by the Pacific Ocean, the Tsugaru Strait, and Hakodate Bay to the east, south, and west, respectively, and is now the city of Chuko.

Hakodate is the third most populous city in Hokkaido, after Sapporo and Asahikawa, and is the administrative, economic, and cultural center of the southern Hokkaido region. Surrounded by the sea on three sides, Hakodate has been an excellent fishing port since ancient times, and the fishing and seafood processing industry has always been one of the main industries in the area, and the squid is a representative specialty. The Port of Hakodate is a natural harbor and a transportation node connecting Hokkaido and Honshu. Hakodate Port was one of Japan's first ports for trade with foreign countries, and Western culture was introduced from the end of the shogunate, and many historical sites have been used to promote the development of the tourism industry. In a survey conducted by the Brand Research Institute, Hakodate City has been ranked as the most attractive municipality in Japan for three consecutive years since 2014. On the other hand, Hakodate City has a serious problem of population decline.

Lake Toya, on the other hand, is located in southwestern Hokkaido and is a lake formed in the Toya Caldera. Lake Toya is the ninth largest lake in Japan by area, and the third largest crater lake after Lake Kussharo and Lake Shikotsu. It is about 11 kilometers wide from east to west and about 9 kilometers long from north to south, and its shape is almost circular. On the southern shore of Lake Toya there are sightseeing spots such as Lake Toya Onsen, Mt. Ju, and Showa Shinzan, making it an important tourist destination in Hokkaido.

The largest island in the middle of the lake is called Nakajima, with an area of 4.85 square kilometers and an elevation of 455 meters at the highest point of the island. The eastern and southeastern areas of Lake Toya are administratively divided into the towns of Stronga, while the rest of the areas belong to the towns of Lake Toya. In addition, Nakajima was inhabited by 2 households with 6 people in Showa 35, but it is now uninhabited. On the south side of Lake Toya, there is the Hokkaido Road No. 2 Toyako Noboribetsu Line, on the east side is the Toya Park Toya Line on the Hokkaido Road No. 132, and on the northwest side is the Toya Hakita Line on the Hokkaido Road No. 578.

The word "Toya" comes from the Ainu word "toya", which means lakeshore. This name was originally used to refer to the place name on the north shore of the lake, but the Waren people called the north shore of the lake to Toya, and used Toya as the name of the lake. The Ainu people refer to Lake Toya as "kim-un-to", which means mountain lake. Locals also pronounce Toya as "どうや".

About 110,000 years ago, a large-scale volcanic eruption occurred in the area around Lake Toya, forming the Toya Crater. The total volume of the ejecta (Toya pyroclastic flow) released during this period was more than 150 cubic kilometers, and it was ejected over a considerable area and accumulated tens of meters.

The ash from this massive eruption was widely distributed at the bottom of the area from Hokkaido to Tohoku Japan, and there were also meadas formed by pyroclastic flow deposits near the crater.

The four islands in the middle of the lake are collectively known as the middle island. The four islands are formed by a collection of volcanic domes and fiery mounds formed by a volcanic eruption about 50,000 years ago. If you include the bottom of the lake, a total of 11 volcanic bodies have been confirmed to be found near Lake Toya. Since 20,000 years ago, volcanic eruptions have occurred on the southern shore of Lake Toya, and Mt. Arisuyama was born.

Lake Toya was originally an extremely nutrient-poor lake, and the water was highly transparent. However, due to the inflow of wastewater from the closure of the mine and the inflow of drainage from places such as the Toyako Onsen Town, the transparency has dropped significantly.

In 1920, the Hosean Power Station was built on the Hoseokan River, a river flowing from Lake Toya, for the purpose of generating hydroelectric power. Later, the Toya Power Station was built using the water from the Nagaryu River, and the Kubotai Reservoir was built upstream of the Nagaryu River, which does not flow into Lake Toya, so that the water from the Nagaryu River flowed into Lake Toya. Since 1907, the upper reaches of the Nagaryu River have successively developed mines such as the Horobetsu Sulfur Mine, the Tokushun Mine and the Benkei Mine. Between 1939 and 1973, these mines were closed one after another, and wastewater from the mines, which had a pH of only about 2, continued to flow into Lake Toya. By 1970, the pH of Lake Toya was only about 5, and the lake water became severely acidic, resulting in the death of a large number of organisms.

In order to solve this problem, in 1973, an operation to neutralize mine wastewater began in the upper reaches of the Nagaryu River. In addition, the eruption of Mount Yusuyama in 1977 (Showa 52) caused a large amount of ash to fall into Lake Toya, and the alkaline ash neutralized the acidic water, and by 1995, the pH level had recovered to about 7. However, it is still unknown whether the effect of artificial neutralization is greater or whether the effect of volcanic ash is greater in the neutralization effect of the lake water.

On the flight, the members of AKB48 were all excited.

Zhu Zi was a little depressed, or he was pretending to be deep.

The girls weren't too embarrassed to disturb him.

"Alas......" After a long time, Zhu Zicai sighed faintly.

"Teacher Zhu Zi, what's wrong with you?" Sitting with Zhu Zi today was Mayu Watanabe, and the girl couldn't help but ask when she saw Zhu Zi's unruly look.

Yuko Oshima, Erika Ikuta, Yona Kojima and other members all pricked up their ears and waited for Zhu Zi's next step.

"Alas, sorrow. ”

"Teacher Zhu Zi, why are you sad? It's not because of Sister Sesame, right?" Ikuta Erika rolled her eyes, and immediately pulled the topic to Masami Nagasawa.

Zhu Zi glanced at Ikuta Erika, this duck head is really a talent, a talent from a crooked building.

"You're too young to understand. ”

"What don't I understand, Teacher Zhu Zi...... You won't be bullied by Sister Sesame-chan, right, or have you done something sorry for Sister Sesame-chan?"

"What do you know, little boy, I'm a sentimental life. ”

"Teacher Zhu Zi, you don't want to marry Nagasawa-san, are you?" asked Atsuko Maeda.

Pay attention to the speechless, this group of little girls is so hateful, I don't give myself a chance if I want to pretend to be a force, can I let myself pretend to be forced before I speak.

"No, I'm so young. You say that a person like me can become the director of NTV at a young age, and he still has such an expression on his hands, isn't it too good?"