OVA
Description
Miku Mizuki is Haru Matogi's lifelong childhood friend whose feelings for him deepened into romance over time, though she initially finds expressing them difficult. She shared classrooms with Haru and witnessed the pivotal incident where Mikami Inaba fell from the school rooftop, fusing with the rabbit Mimika. This event granted Miku unique immunity to the perception-altering abilities emitted by Mimika's rabbit ears. Consequently, Miku alone remembers Mimika's true origin while everyone else perceives her as always human.

Miku's jealousy flares when Mimika, now inhabiting Mikami's human form, openly pursues Haru with clingy behavior and physical advances. Despite this frustration and resentment of the romantic rivalry, she maintains a genuine fondness for Mimika personally. Her jealousy manifests visibly through puffed cheeks and audible anger, alongside internal monologues fixated on Haru's attention. She frequently attempts to redirect Haru's focus towards her own physical attributes, specifically her bust, which she considers substantial though smaller than Mimika's.

Miku wears a standard school uniform featuring a serafuku-style top and a distinctive pleated yellow skirt. Her appearance includes aubergine-colored hair, blue eyes, and a figure often noted for its bust size in narrative comparisons. During a school cultural festival, she volunteers for a cosplay event, dressing as a nurse wielding a giant prop syringe, which draws male classmates' attention. Emotionally, she balances affection for Mimika as a friend with fierce determination to compete for Haru's affection, sometimes contemplating tactics like an indirect kiss via his drink. She participates in critical events, including the climactic shopping mall confrontation where Mikami Inaba rescues her and Haru, leading to the separation of Mikami and Mimika. This resolution allows Haru to regain his original pet rabbit and Mikami to reintegrate socially with Haru and Miku. Throughout, Miku's core traits persist: unwavering loyalty to Haru, competitive jealousy toward romantic rivals, and the internal conflict between her inherent kindness and possessiveness.