For those for whom it wasn’t clear that Aqua likes Kana, Akane, who Akasaka uses as the voice of reason in Oshi no Ko, pretty much outright stated in Episode 26 that that is the case. This is not to say that Akane has no chance in the end, but I’m just sharing why it very much makes sense that Aqua currently likes Kana.
Aqua slowly growing to like Kana was built up on early in the series and was literally intentional. Yes, Aqua did state that he wanted to kill Kana back when they were small kids ’cause of how insufferable she was, but fixating on that one line to try to suggest that he doesn’t like Kana was blatantly disregarding what the story was actually telling.
Just note how Gotanda took note of the difference between Aqua’s reactions to Kana and Akane wanting to see his childhood acting. Although Gotanda didn’t draw any conclusions from what he observed, one reason for the contrast in Aqua’s reactions was to show that as much as Aqua likes to put out that he doesn’t enjoy acting or want to be in the industry, he was still self-conscious enough to not want Kana to see his childhood acting. If he truly didn’t give care even an iota about acting, he also wouldn’t have cared if Kana had seen it or perhaps reluctantly allowed her to see it eventually if he didn’t have any expectations of his abilities. Yes, I know he was a long-time fan of Kana at that point, which contributed to his decision to not allow her to see it, but he wouldn’t have denied Kana seeing his childhood acting so pointedly if he didn’t care at all.
Thus, I believe whether it’s due to being born as Ai’s son or ’cause Ai literally said that she wanted Aqua to be an actor, Aqua does genuinely have some level of desire to be in the Japanese entertainment industry beyond wanting to use the industry as a means of getting revenge on his father.
As much as Aqua talked about his lack of intention to continue in the industry given how he failed Gotanda, who gave him multiple opportunities repeatedly, I believe Kana sharing how she was encouraged that Aqua was also struggling along with her in a world shrouded in darkness and how she personally likes his acting as it feels like that of someone who’s put in the work for a long time with him using techniques that are considerate and meticulous validated Aqua wanting to be an actor, whether subconsciously or consciously, at the direction of his mother, Ai. Although some people may dismiss that scene as only about Kana feeling kinship with Aqua, I believe her words did resonate with him on some level as Ai was a huge influence on him back when she was still alive and even after, meaning deep-down he hoped to hear someone affirm that he had acting chops, and since he followed Kana’s career from childhood, her words meant a lot to him even if part of the reason she said what she did was ’cause of what she learned from childhood that people skills are in a way more important than raw talent in the industry.
As someone who has experienced trauma, I know for a fact that a substantial number of people are drawn to people who activate their trauma, not ’cause of a desire to hurt themselves but due to a subconscious attempt to resolve past traumas, which is what leads them to seek a familiar situation, and I know this because I myself like someone who activates my trauma, so I speak from experience. In asking Kana to join his sister’s idol group, he inadvertently created a situation that reactivated his trauma once Akane put it into his mind what could happen to Kana, and whether it be to due to his subconscious influencing him to seek a familiar situation in making that request of Kana or ’cause he saw how accommodating of a person Kana was for the Sweet Today project, which made Kana the perfect person for him to rely on to take care of his sister, Ruby, the situation that eventually ensued with Aqua avoiding Kana in fear of her being killed was a very natural progression of events for people who understand how trauma can affect a person.
And furthermore, another reason Kana is an easy person for Aqua to fall for is she had something more going for her than someone like Akane in that Aqua spent time with Kana in early childhood, and Kana is thus somewhat of a reminder of what things were like back before Ai was murdered and when Ai had wanted him to pursue acting. Hell, Kana herself having expectations of his acting is like a continuation of Ai having expectations him, which increases the sense of familiarity of the situation. Even though his life was thrown upside down after Ai was murdered, he did have a loving mother who genuinely wished the best for him, and that film he was in with Kana was Aqua’s shining moment in the industry for a long time. Kana may have been intolerable as a young child, but she actually has people skills now to iron out her worst qualities, and Aqua still likes the dynamic he has with her casually roasting him due to that past meeting. As much as Akane supports Aqua emotionally and how she’s the one Aqua has shared his issues with, and how she’s the one who improved his acting, he still likes Kana at the moment and that development is rooted in real-world experiences with trauma survivors often being drawn to certain familiar situations.