PopRot / Anime / 22/7 / Episodes

22/7 Episode 13: 8+3=? Guide

August 9, 2026 · 22/7, Anime, Episodes

POPROT / ANIME / 22/7 / EPISODES

22/7 Episode 13: 8+3=?

Spoiler note: This guide discusses the episode premise and character focus.

Quick facts

Episode: 13 of 13
Title: 8+3=?
Series: 22/7 / Nanabun no Nijyuuni
Runtime: about 24 minutes
Canon/filler label: Extra episode / bonus follow-up

Original summary

22/7 make a comeback in front of their fans on 12/24, which is the anniversary of when they formed the group. The next day the eight members gather at the agency, where they discover that the Wall has been completely restored to its original state. As the mystery deepens, Sakura proposes a Christmas party to celebrate the reunion of the group and to clear out any bad vibes. Suddenly three strangers enter the room. They are wearing the same uniform as the eight members, and they introduce themselves as Mikami Kamiki, Yuki Tojo, and Tsubomi Hiiragi. They claim that they are new members gathered by the Wall.

What happens in the episode

This episode entry is based on the official episode listing and behind-the-scenes source notes available for this title. In PopRot wording: 22/7 make a comeback in front of their fans on 12/24, which is the anniversary of when they formed the group. The next day the eight members gather at the agency, where they discover that the Wall has been completely restored to its original state. As the mystery deepens, Sakura proposes a Christmas party to celebrate the reunion of the group and to clear out any bad vibes. Suddenly three strangers enter the room. They are wearing the same uniform as the eight members, and they introduce themselves as Mikami Kamiki, Yuki Tojo, and Tsubomi Hiiragi. They claim that they are new members gathered by the Wall. The important through-line is how the Wall and the agency framework force the girls to act like a unit before they always feel like one, while individual focus episodes reveal why a member's idol identity is complicated.

Watch or skip?

Watch. 22/7 is built around member-focus progression and group pressure, so skipping episodes weakens the emotional map. The extra episode is less essential to the central TV arc, but it is still useful for completionists and fans of the wider idol unit.