Chiyo Yumehara, a PK Academy student, sports short orange-brown hair secured by a pink hairband and warm hazel eyes. Her interactions revolve around romantic pursuits marked by swiftly changing affections. Initially drawn to Saiki Kusuo, she employs numerous tactics to capture his interest before briefly dating Takeru Shinoda, whose poor hygiene and monotonous habits prompt their split. Returning her focus to Saiki, she later shifts attention to Shun Kaidou after he confronts classmates mocking her during a beach outing, sparking a physical clash. Past relationships include Akanishi Shinichi, who manipulated her financially, and Takeru, whose unkempt behavior led to their dissolution. Aiura Mikoto foretells a future of four divorces, citing Chiyo’s fluctuating emotional bonds. School trips trigger drastic weight changes as self-consciousness drives extreme dieting, swiftly abandoned when embarrassment fades or new romantic goals emerge. Ranked 139th academically among 181 peers, she privately claims her hairband serves as a mystical "seal," reflecting mild chuunibyou inclinations. In junior high, she penned a self-insert novel on a defunct personal blog. Her aura flickers with miniature hearts, and her guardian spirit aligns with a political figure’s legacy. Named for "yochi yume" ("prophetic dreams"), her romantic idealism clashes with a history of impulsive decisions and emotional instability, often swayed by others’ approval or theatric circumstances.