Don't Call Me Dia-san

Don't Call Me Dia-san (ダイヤさんと呼ばないで), also called "Don't Be So Formal with Me", is the fourth episode of the ''Love Live! Sunshine!! Season 2'' anime series. It was aired on October 28, 2017.

Summary
After passing the Love Live qualifiers, the girls realize that they are short on cash for their activites and start looking for ways to raise some money. Meanwhile, Dia becomes uneasy with how Kanan and Mari are close with the others and starts looking for ways to get more personal with them to no avail, even after some counseling with her third year friends. During a part-time job at the local aquarium, some children start making a ruckus until Dia steps in to calm them down. Once Kanan and Mari reveal to the others Dia's intentions, they approach her and reveal that they admire her mature, responsible self and she does not need to change for their sake.

Cast

 * Anju Inami as Chika Takami
 * Rikako Aida as Riko Sakurauchi
 * Nanaka Suwa as Kanan Matsuura
 * Arisa Komiya as Dia Kurosawa
 * Shuka Saito as You Watanabe
 * Aika Kobayashi as Yoshiko Tsushima
 * Kanako Takatsuki as Hanamaru Kunikida
 * Aina Suzuki as Mari Ohara
 * Ai Furihata as Ruby Kurosawa
 * Kana Asumi as Shima Takami
 * Kanae Ito as Mito Takami
 * Tano Asami as Sarah Kazuno
 * Anna Mugiho as Shiitake

Errors & Goofs:

 * Animation Errors:
 * At 7:01, Dia is missing her hairpins before it reappears in 7:06.
 * in 14:32 - 14:34, before the camera view changes, Hanamaru is the person standing at the front. However, when the view changes, Hanamaru's hair is colored like Riko's.
 * at 17:44, the position and coloring of the balloons You were holding changes after she releases them.
 * in 18:31 - 18:37, Riko is seen wearing the same apron that Chika & Hanamaru used, but the apron disappears at 18:43.
 * Continuity Errors:
 * When the bowl slips out of Hanamaru's hands at 18:16, it looks like it will land on its bottom, right-side up. However, as it lands on Dia's head, it has suddenly flipped upside-down.