A girl in the third grade of elementary school, Wohara Kiko (Mana Ashida), was born in a poor family of eight in Osaka. Grandpa Shitai (ぃしだぁゆみ Mikijiro Hira) and grandma Zhi Zi () are both old and rare; Her father Guan Tai (Norito Yashima) is an ordinary convenient house, and her mother Shiori (Aki Hano) and her father have known each other since their school days. In addition, there are three triplet sisters on the piano: Lizi, Zhenzi and Peng Mei (Misato Aoyama). The lively Vochala family sits around the crimson round dining table every day, chattering nonstop, and having the happiness envied by ordinary people while making noise. However, Qin Zi didn't like it at all.

At the age of curiosity, Qin Zi would carefully write down the words she first met and was interested in in in her notebook. But this notebook with a strange cover sometimes disappears quietly. In fact, my sister Peng Mei secretly borrowed it to read.

At school, I have a best friend, that is, my classmate Bo (Ito Hideyoshi) who lives near my home. A Bo stutters a little. In Qin Zi's eyes, this problem is not only different, but even different. Hate "ordinary" things, she didn't mean to laugh at Po at all, but began to stutter like each other. In addition, there are many "extraordinary people" who make Qin Zi have a strong interest and a desire to imitate. For example, Hui Mei Tian Xiang (Mi Zu Ki Kusano) who wears an eye mask because of a sty, Goku (Hiragi Nozawa) whose parents are Vietnamese boat people, and Park Kui-shih (Tai Tai Xiao Gu), a Japanese and Korean who suddenly fainted due to arrhythmia. These friends seem to have opened the door to the unknown world for Qin Zi to enjoy the tour, while the teacher (Maruyama Ryuhei), as the head teacher, looks kindly at this strange but lovely and naive little girl.

On this day, Qin Zi learned that her mother was pregnant. The whole family is happy with the good news, but the piano disagrees. During this period, Po and Grandpa's words were deeply imprinted in Qin Zi's mind, which made her think deeply. When the annual summer vacation comes, Qin Zi, who is eager to raise small animals, cannot realize this wish at home. She and Po go to school to raise rabbits every day. The free research assignment in summer vacation is actually to observe how mosquitoes suck blood on their arms. Every busy day passed leisurely, until Abom left something behind, and Xiaoqinzi ushered in a lonely summer. ...