Shiori Sekine/Relationships

Masami Iwasawa
Sekine's views on Iwasawa aligns mostly with everyone: that she's a cool beauty who deserves something genuine.

Since Iwasawa doesn't have much to speak about other than her life and music, she finds it difficult to start conversations with her that don't lie on the basis of music. When Iwasawa herself began to talk about topics that didn't fall under music, Sekine was insanely shocked alongside the rest of Girls Dead Monster. She initially thought some type of anomaly was affecting Iwasawa's life. Enlisting Irie, she began her private investigation on Iwasawa and the underlying cause of this development.

Quickly, Sekine realized the anomaly itself in Chapter 5, when Iwasawa spoke up about wanting to hear Otonashi's story.

Hisako
While Sekine doesn't make comparisons between Iwasawa and Hisako, she sees Hisako as Iwasawa's partner in crime, often relaying information to both her and Irie. Hisako on occasion has to correct Sekine for her behavior, especially when it involves mischief or picking on Irie.

Hisako resorts to violence when correcting Sekine, slapping or kicking her depending on her mood and the severity of Sekine's actions.

Miyuki Irie
With Irie as her best friend, they usually conduct their daily life together. On occasion, Sekine treats Irie like a little kid, often embarassing her and putting her in uncomfortable situations. While it may go as far as borderline bullying, Sekine truly cares for Irie's wellbeing. She expresses her care through light-hearted moments such as practical jokes, metaphors, and constant hugging.

Sekine's nature of mischief usually drags Miyuki alongside her, often getting both of them in trouble.