Ep. 4: Nabi breaks up with Doki to protect her, leading to his arrest and her solo journey to Paradise.

Step 4 depicts intense conflict between supporters and opponents of interspecies relationships, marked by widespread harassment and graffiti. Nabi and Doki face hostility from various groups, while a movement led by a rabbit from Step 3 grows alongside a larger, segregated anti-interspecies faction. After Doki is attacked and hospitalized, a terrified Nabi ends their relationship to keep her safe, even displaying an anti-interspecies sign. As Doki attempts to save the dying hedgehog, she purchases tickets to Paradise, a place where such couples can live peacefully. Il-ho confronts Nabi, triggering a riot that results in their imprisonment. Following the hedgehog's death, Doki attempts to contact Nabi but fails due to his incarceration. Ultimately, she abandons her hope of joining him and travels to Paradise alone.
Episodes
- Ep. 1 · A female rabbit pursues a male cat despite societal disapproval of their interspecies romance.
- Ep. 2 · Nabi struggles to deliver a birthday cake to Doki amidst city chaos and rabbit chases.
- Ep. 3 · Nabi receives a present from Doki, leading to a date with interspecies prejudice and a violent ending.
- Ep. 4 · Nabi breaks up with Doki to protect her, leading to his arrest and her solo journey to Paradise.
- Ep. 5 · Nabi follows a bird to Doki's prayer tree and rushes to the airport to stop her departure.