Unable to turn Minami Hiroyuki = Minami-kun (Yasaki Yagi) into a 15cm villain, he was left alone at home. Horikiri Chiyomi (Iinuma Ai) hid him in her breast pocket and went to school together.The two of them, who had been in a good mood since the morning, had just walked out of the house when Misuzu (Rena Takeda), the coach of the college basketball team and a secret crush on Minami-kun, showed up!“Where did you hide Nanjun?”“Go tell him and let him return to the team”.Facing Mei Ling who was pressing closer and closer, Chiyomi could not tell the truth and could only remain silent.Mei Ling was very worried about Nan Jun. Chiyomi only left one sentence: "(I will) believe his words and wait patiently"...

Although she was uneasy in her heart, Chiyomi still tried her best not to be noticed by the people around her, talking to Nanjun, eating lunch together on the roof... enjoying her school life with Nanjun.Moreover, Chiyomi went to the handicraft department to make clothes for Nanjun...!

At the weekend, Chiyomi and Nanjun went to the amusement park together.The two of them were chatting happily while walking through the Crow Shopping Street, but unexpectedly, Hisako Ochako (Shigeru Muroi) saw them from the dark!She excitedly reported to Kaede (Kimura Yoshino) and Yuriko (Kaga Mariko) that little Nanjun was in Chiyomi's pocket!%but......

Soon after, Nanjun’s father Haruyuki (Sawamura Kazuki) appeared at the grilled chicken restaurant Shintaro (Takeda Shinji) runs.Everyone in the Horikiri family also gathered together, and in the lively atmosphere, a secret that Nanjun didn't know about his mother, Kaoruko (Akiko Yagi), was revealed...!