While Keiichi is busy setting up good luck charms around the temple grounds, Urd decides to work on his relationship with Belldandy. She lets Bell know about the Japanese custom where a girl makes chocolate for the man she loves (or likes) and gives it to him on Valentine's Day. Bell feels bad that she didn't know about this custom and thus didn't give Keiichi chocolate the previous year, so off she goes to make it up to him.

These events are recorded by a demonized video camera which returns to Mara's lair in Sayoko's attic to report the news. She sees the good luck charms Keiichi is planting and thus can avoid them all. She then goes to check on her booster demons as she readies her next plan to deal with the goddesses.

Meanwhile, Urd has brewed another love potion while Belldandy lovingly makes a large heart-shaped chocolate for Keiichi. Urd makes an identical chocolate filled with the love potion. She imitates Keiichi's voice to get Bell to leave while she switches chocolates. The demon-camera sees Belldandy leave and reports this to Mara. She also has an identical chocolate to Belldandy's and has one of her booster demons go in to switch it with the one inside. Her chocolate would turn Keiichi evil should he eat it since he is good.

When Keiichi denies having called Belldandy, she suspects Urd is up to something. She tricks Urd into confessing, so Urd reluctantly agrees to return Bell's chocolate. In exchange, Bell gives Urd the chocolate Mara had switched, while the booster demon gives Mara the chocolate Urd had switched. Mara crushes the Urd-chocolate and the booster demons begin to greedily consume it. They stop eating when Mara has them form the Mara Pyramid Power Boost and sits within it.

Belldandy gives him her chocolate and Urd offers hers as well. He begins eating Bell's chocolate when Mara starts laughing and appears inside the temple surrounded by the booster demons in their pyramid formation. Belldandy launches an attack spell at Mara, but within the pyramid, Mara is well protected. She announces that Keiichi is poisoned, yet Keiichi seems normal. Since the poison should have kicked in immediately, Mara begins to demand an answer from the booster demons. Due to Urd's love potion in the chocolate they consumed, they have only one thought on the brain - get the chocolate. Urd is holding Mara's chocolate, so the booster demons are all over her to get it. She throws it and them away from her, and the booster demons immediately consume Mara's chocolate.

Mara is ticked that a goddess would spike a chocolate the same way she did. Before she can react further, Mara's poison takes over the booster demons. Since they were evil, the poison causes them to all turn good and worship Belldandy. They decide to atone for their sins by attacking Mara. She is not amused and counter attacks. Belldandy launches an attack of her own. Mara isn't concerned about Bell's attack until the booster demons form a hyper star boost. Belldandy's energy ball attack passes through the hyper star and literally knocks Mara through the roof and off through the sky. Urd restores the expended booster demons and combines them into a large, single demon critter called Sudaru.