The Narita family is thrown into chaos when it's revealed that Hiiragi has a cosplayer friend! Hiiragi decides to publish a book with her friend at an event. Ito supports Hiiragi, but Gen doesn't seem happy about it. On the day of the event, Hiiragi musters up her courage and goes to meet her friend.

It's Christmas and everyone is home! After a huge party, Ito learns this day is very special for the Naritas.