Chihaya Suzuhara serves as Kazuki Arisaka's close friend and a prominent secondary character. She maintains an outgoing, playful personality, frequently eavesdropping or observing others, especially to monitor interactions between Kazuki and Yuuji Kagura.

Her speech carries a distinct Kansai dialect. Chihaya exhibits notable tolerance, even occasional encouragement, towards Yuuji's overtly flirtatious and perverse tendencies, contrasting sharply with Kazuki's reactions. This includes deliberately flashing her underwear at Yuuji or making remarks acknowledging his behavior as typical for boys his age. Her permissiveness sometimes fuels rivalry or jealousy within her friendship with Kazuki, particularly when she explicitly states she would pursue Yuuji if Kazuki remained uninterested—a teasing comment that visibly impacts Kazuki emotionally.

Within the story's central romantic dynamic, Chihaya embodies the "Veronica" archetype (seductive, confident rival), contrasting Kazuki's "Betty" role (sweet, childhood friend) for Yuuji's affections. Her actions, including flirting with Yuuji and declaring potential romantic interest, primarily provoke Kazuki into confronting her own suppressed feelings. She explicitly advises Kazuki to reconcile with Yuuji before someone else develops a genuine relationship with him, highlighting her role in advancing the main romantic plot.

Physically, she has brown hair typically styled in twintails or a ponytail, pink eyes, and is often depicted wearing her school uniform with knee-high socks. Chihaya is recognized as highly capable, frequently surpassing Kazuki in various activities, contributing to Kazuki's sense of insecurity.

Her character remains consistent throughout the available material, functioning as Kazuki's friend and Yuuji's teaser. Her role centers on instigating romantic tension through her teasing nature and serving as a foil to Kazuki's more restrained personality.