kenkou ni yoku nai! (bang dream!)

Scene from episode 4 of BanG Dream! Ave Mujica, where Wakaba Mutsumi's alternate personality Mortis says the line, 「健康によくない！」("Kenkou ni yoku nai!", translated as "It's not good for her health!") about Togawa Sakiko's sleeping habits to Misumi Uika while making an x fingers gesture. This gesture appears similar to one made by Nagasaki Soyo during episode 3 of BanG Dream! It's MyGO!!!!!.

Reference

• Danbooru asset #24707819: Ave Mujica
  Episode 4, 5:22
• Danbooru asset #24708896: It's MyGO!!!!!
  Episode 3, 14:09