When Yuka walks in on Kouta undressing Nyu, a lot of things must run through her head. While it makes sense to get soaked clothes off someone before they catch cold, Nyu is also a beautiful woman, and one with serious mental differences. Yuka’s initial thoughts probably dwell on how bad it looks. But on a more basic level, Yuka doesn’t want Kouta doing anything with another woman, whether it’s harmless or not. As far as she’s concerned, Kouta belongs to her.
A lot of questions ran through my head during Chief Kurama’s encounter with Nana in her detention cell. Like “why is she naked?” or “why is she drenched in blood?”, or “how long has she been like this?”. The exact nature of her situation is kept pretty vague, but suffice it to say Nana has lived her whole life in the facility, enduring what amounts to unspeakable torture with a smile.
As such, Nana knows no other life, and no other comfort but Kurama as her “father”. So she’ll do anything for him…except kill. Instead, she’ll try to detain Lucy for him if she can. All she asks for in return is his necktie, which she uses to conceal her horns.
Yuka tries to stay away from the house where watching Kouta with Nyu causes her so much discomfort owing to her Deep Feelings for him (incidentally, the episode’s title). But when she drops off some of her clothes for Nyu, she finds Kouta has caught cold from his beach excursion, and Nyu is absolutely helpless to care for him.
Back at the lab, Kurama speaks to Bondo about undergoing castration…which is probably not what he should have started off with. He then describes who and what it was that Bondo lost so badly to, and the reason castrating him might save humanity: Lucy can “reproduce” through her vectors, causing the mutation in whomever she touches with him. In that way, she and her kind could one day overrun humanity as we know it.
Yuka decides that if Kouta won’t take Lucy to the authorities, then she’ll just move in to keep an eye on both of them. She puts Kouta to work cleaning up the house, and Nyu is eager to pitch in. That’s when Mayu, the runaway girl with the dog, shows up with Kouta’s umbrella. He has many questions about that night on the beach with Nyu and the soldier.
Nyu ends up slipping and falling, and whether due to the impact of the fall or the music box that plays the show’s theme song (or both…or neither), she reverts back to Lucy. She comes this close to killing Kouta with her Vectors before a flash of a younger Kouta stops them dead. Lucy runs outside, and for a moment the show makes us wonder if she killed Mayu’s cute puppy. It turns out she just set it free, but it soon runs back to Mayu.
As Yuka tries to talk to Kouta about whether he has any feelings at all for her (he seems to have lost a lot of the memories of the two of them that she cherishes), Lucy wanders off, eventually encountering Nana, whom she sensed was coming. Kurama’s underlings don’t think Nana is any match for Lucy, but Lucy’s problem is she never knows when she’s going to devolve back into Nyu…and Nyu isn’t a match for anyone.