Urd Arrives Through the Television
Urd makes one of the OVA's best entrances by coming straight through Keiichi's television and immediately behaving as though the real problem in the household is obvious: Keiichi and Belldandy are taking far too long to become a proper couple.
Her confidence is useful and disastrous in roughly equal measure. Urd understands more about the divine system than Keiichi does, but she also believes intervention is usually better than patience. That makes her the sister most likely to create a crisis while sincerely trying to help.
Why it matters
Urd expands the series from 'man meets goddess' into a family comedy. Belldandy does not arrive on Earth without history or relatives, and those relatives have opinions.
Debut: Ep 002 - Midsummer Night's Dream
Urd's Love Potion Plan
Urd decides that Keiichi and Belldandy need chemical assistance and brings a love potion into the beach trip. Predictably, the plan does not produce a clean romantic breakthrough. Sayoko gets pulled into the mess, Keiichi spends more time reacting to Urd's interference than expressing himself, and Belldandy has to sort out her own feelings amid the confusion.
The scheme fails as manipulation and succeeds as pressure. Once all the artificial pushing falls apart, Belldandy can answer Keiichi honestly.
Why it worked
Not because the potion worked properly. Urd's plan removes the couple's ability to keep pretending nothing is happening, and then Belldandy makes the important choice herself.
Debut: Ep 002 - Midsummer Night's Dream