Jonathan and Erina first met when they were both 12 years old. Jonathan had defended her from a pair of bullies who were teasing her over a doll modeled after her. Jonathan jumped in to defend her despite not knowing her, and knowing that he would lose against the bullies. After Jonathan had left, Erina had found his handkerchief on the ground with his name on it. The two then formally met a while after Jonathan's life had spiraled into misery after the arrival of Dio Brando. During that time in Jonathan's life, Erina cheered him up, and they had begun to fall in love. This was short-lived however, as Dio forced himself upon Erina in an attempt to destroy the blossoming romance between Erina and Jonathan. Shortly after this event, Erina moved to India with her family.
About 8 years later, Erina moves back to England after Jonathan's fight with the newly Vampire-turned Dio. Erina tends to Jonathan's wounds, and as Jonathan drifts back into consciousness, he recognizes Erina, and is filled with joy. After Jonathan's final battle with Dio, he and Erina get married, and head to a honeymoon in America. At this time, Erina is currently pregnant with their child. Unfortunately, during the journey, Dio makes one last appearance to kill Jonathan. Jonathan saves Erina before he dies, and Erina escapes after Jonathan sacrifices his life to save her.
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Jonarina is one of the few canon ships in JoJo's Bizarre Adventure, as most characters don't live long enough to enter a relationship. The ship's canonicity and fact that the characters lived longer than others helped fuel its popularity. On AO3, Jonarina is the most popular paring for Erina and the second most popular pairing for Jonathan. Its main rival ship is JonaDio, which has more than three times the number of works on AO3 than Jonarina.
- Jonathan's relationship with Erina on Jojo's Bizarre Encyclopedia
- Erina's relationship with Jonathan on Jojo's Bizarre Encyclopedia
- Jonarina was the first canon ship in JoJo's Bizarre Adventure.
- Erina and Jonathan's child was the father of the second JoJo in the series, Joseph Joestar.