This is not a rom-com. It feels like the author either set out to write a romantic comedy and their own trauma got in the way, or, worse, the author intended this from the start and just has a delusional power fantasy about solving deep seated familial emotional trauma through the power of love. Umm, no.
The big issue here is that the mother and the MC's mental health as a result of his childhood is set-up like the main antagonist. It feels like an obstacle to overcome for the main character to gain the reward of happiness and it will all happen through a magical relationship with Asano. This is the type of storybook plot that tries, but ultimately falls flat on its face with the emotional trauma stuff. Speaking from experience, there's no magic solution here. At the very most Asano can serve as a catalyst for the MC to recognize that he needs to address his mental health, and the arranged relationship can serve as a breaking point for the relationship between the MC and mom that forces them to confront each other better. In both cases there's serious work that needs to be done, which will never really be finished (though they will get to a healthier state). The reality is that this mental health subplot or challenge is bigger than the rom-com itself. I don't care about their potential relationship anymore, that doesn't matter. What I care about is this guy getting to be in a state where I'm not wondering if he's "okay". The situation can be communicated to Asano and if she wants to support him and wait for him to find more stable footing in life good for them. If she's so down bad that she's willing to go through all that with him, then good for her. However, she's still just not the important thing here anymore. What I'm afraid of is the author giving this a chapter or two more, handwaving the emotional trauma away in like a scene of revelation, and then trying to end on the happy couple.