Gojo Niina, who aims to become a doll head maker, is too devoted to dolls and has trouble fitting in with her classmates because her hobbies are not the same as her peers. One day, Gojo's sewing machine at home breaks down and she is unable to make clothes for dolls. Niina comes up with the idea of ​​borrowing a sewing machine from the clothing room at her high school. While Gojo is making clothes in the empty clothing room early in the morning, Kitagawa Marin, a central figure in the class, comes in. Marin is a cheerful gal who lives in a different world than Gojo. Gojo is so surprised when Marin sees her making clothes that she drops the doll to the floor. Gojo immediately hides the doll due to a past trauma, but Marin's reaction is different from what Gojo expected, and she praises her for looking at the doll. Marin suddenly starts taking off her clothes, saying that she wants Gojo, who can sew, to see something.

Gojo is tasked with making a cosplay costume for Marin. She can't believe that she has made contact with Marin, who lives in a different world than her. Then, Marin suddenly comes to Gojo's house. She says that she couldn't wait to get her measurements taken, so she checked out Gojo's house. Gojo is surprised by Marin's initiative, but she manages to get her measurements taken. After the holidays, Marin talks to Gojo without any hesitation at school, but Gojo tries to keep her distance, worried about what others think. Marin tells Gojo that she doesn't understand why she is being avoided even though they are friends. Niina can't hide her joy at having someone who calls her a friend for the first time, and decides to work hard to make a costume for Marin. Gojo then reveals to Marin that she wants to become a head priest, and opens up to her. Meanwhile, Gojo finds out that Marin is planning to participate in a cosplay event. However, the event is approaching in two weeks.

There are only two weeks left until the cosplay event. Gojo is getting anxious because he can't find the time he wants to make a costume. Will Gojo be able to make a costume for Marin?

Gojo, who had successfully finished making the cosplay costume for Shizuku-tan, was sad that the time he spent with Marin was coming to an end. While Gojo was thinking about this, Marin asked him for advice on what to do for the next cosplay costume.