This is a story about affection in the virtual network era. No matter who you are and where you are, you can simply use public services such as e-mail, e-wallet and information search. An imaginary city like reality has been established and spread to all corners of the world. Kenji, the hero, is an introverted science boy who was dragged to Ueda City, Nagano Prefecture, his hometown by his predecessor, Xiaxi Shinohara, during the summer vacation. There is a Warring States family that has existed since the Muromachi era, and it is a family in the array. Headed by Xia's 90-year-old great-grandmother, there are doctors, fishermen, firefighters, channel managers, electrical store owners, police, officers of the Self-Defense Forces, primary school students to babies, and relatives from all walks of life. During the summer vacation in this bustling Tian She, Kenji saw the excitement and harmony of the family in the array. One night, Kenji received an email about a suspicious math quiz. He couldn't help but be curious and answered it all night. But he didn't know that it would cause a catastrophe ... a mysterious virtual image appeared in the imaginary city of Oz, which was connected with the world. He thinks that the perfect password of oz's management building was obtained by a group of people headed by Kenji through analysis in the form of quiz. Invasion of the core management building of oz, sealing up the accounts of more than 400 million people, causing world chaos. Paralyzing the traffic management system and emergency notification system, creating chaos in police stations, fire stations and hospitals, resulting in paralysis. The management procedure of the invasion channel flooded the city, stopped all kinds of financial circulation, and plunged the whole of Japan into chaos. Arong's mother-in-law, who caused an uproar, showed her kingly demeanor in front of people who were caught off guard. Take the prestige of the elders as a weapon to take the lead in fighting. Fight against virtual opponents in simulated connections. However, the personal monitor with an analog account captured in OZ is a forged personal monitor, which is why Kenji was arrested. In Oz, there was a group that summarized all kinds of fighting skills. In the area under his management, various combat meetings were held according to certain rules. But the virtual opponent canceled his management authority and turned the whole oz world into a fighting stage. In other words, this virtual opponent took control of countless accounts and began to attack the real society. ...