Once upon a time, there was a geometry book and a book about pi. A little fox ate the pi book, causing its belly to become round. Mother Hen ate the geometry book, and as a result, even her footprints turned into addition, subtraction, multiplication, and division symbols. After eating the geometry book, Mother Hen gave birth to seven chicks, each with a strange shape. However, because Mother Hen had eaten a geometry book, these seven chicks took the form of common geometric shapes. Mother Hen also gave each of them a name based on their shape. One day, the seven chicks were playing hide-and-seek while Mother Hen was putting on makeup. After a while, the seven chicks finished their game and went for a walk, while Mother Hen, having finished her makeup, was looking in the mirror. Suddenly, Old Wolf arrived. Seeing the danger, Mother Hen threw the mirror to the ground. Old Wolf slipped on the mirror and at the same time spotted a monster—a creature formed by the seven chicks combined. Terrified, Old Wolf fled in a panic, crashing into a "No Wolves Allowed" sign ahead and fainting. After Old Wolf passed out, the monster transformed back into the seven chicks. The chicks grew excited at the sight of Old Wolf lying unconscious. But before long, Old Wolf woke up, realized it was the seven chicks who had caused this, and began chasing them. However, four of the chicks formed a seesaw, while the other three had already escaped into a tree. Just as Old Wolf was about to step off the seesaw, the three chicks jumped down from the tree, delivering a powerful bounce that launched Old Wolf high into the sky. The seven chicks were busy moving apples when suddenly Old Wolf said, "Yoohoo! I'm back! No need to prepare fruit for me—don’t you know I only eat meat?" Seeing this, Mother Hen whistled, and the seven chicks immediately transformed into a tank. Mother Hen used the apples as cannonballs to attack Old Wolf. Old Wolf turned and fled at the sight of the apple cannonballs, but the tank kept firing. Old Wolf used its tail to shield itself, and the apples ended up skewered on its tail like a kebab. Unable to defeat the tank, Old Wolf ran to a rocky mountain to take shelter. The tank then transformed back into the seven chicks, who cheered in triumph. Hiding behind the rocky mountain, Old Wolf said, "Oh my! Good thing I have a tail, or my rear would have been blown to bits." Old Wolf took an apple from its tail, took a bite, found it too bitter, threw it away, and grumbled, "I want meat!" Coincidentally, the little fox overheard this and mocked Old Wolf. Old Wolf noticed that the little fox was a self-proclaimed "circle expert" who couldn’t even draw a proper circle, and mocked it in return. Mother Hen was teaching the chicks when the little fox also showed up. Soon after, Old Wolf returned to cause trouble again. Mother Hen once again had the seven chicks transform into a tank. Still smarting from Old Wolf’s mockery, the little fox wanted to prove it was perfectly round by becoming one of the tank’s wheels. However, the little fox ended up taking the place of the spherical chick, causing the tank to become lopsided. Old Wolf grew smug at this. Since the tank wasn’t working properly, when Mother Hen fired the cannon, the cannonball hit a tree and then flew back toward her. Afraid of being hit, Mother Hen jumped—only to be caught by Old Wolf. With Mother Hen captured, the tank transformed back into the chicks, who cried as they searched for their mother. Hearing their cries, the little fox decided to go after Old Wolf but, concerned for the chicks’ safety, stayed behind and began crying too. The seven chicks heard the little fox’s sobs and approached. The spherical chick said to the little fox, "Was it you who took my place earlier?" The other six chicks all agreed it was the little fox. The little fox said, "I just wanted to prove I was the roundest—I was tricked by Old Wolf!" The seven chicks accused the little fox of lying. The cone-shaped chick added, "We don’t believe you! You’re in cahoots with Old Wolf! You helped capture our mother, didn’t you?" The little fox insisted, "I really just wanted to prove I was the roundest." The cone chick retorted, "We’ll never trust you again!" The seven chicks went off to search for their mother, while the little fox vowed to rescue Mother Hen. After capturing Mother Hen, Old Wolf dug a trap on the ground and drew Mother Hen’s footprints nearby, hoping the chicks would follow the tracks, fall into the