It's still vague as to whether Tsubaki is responsible for her husband's death or if his family resents her for some other reason. The sister clearly has conflicting feelings about her, though she's putting up that front and keeping Tsubaki at arm's length all the same. Whether that's to appease her parents/family, remains to be seen.
Otakei having to grapple with the notion that overcoming himself to achieve his goal seems like it'll be the core of his character arc, then. Drawing on one's experiences when drawing, writing, or even composing is a pretty well-trod path for the creative individual, so getting over the Past Cringe and embarrassment of his past & memories would be a good idea, given it's all fuel to pull from in getting his debut. Especially as they're not remotely singular sentiments, and thus would be intimately relatable for potential readers (even if the names and places are different, everyone's got shit they'd like to forget to some degree).
Tsubaki will likely factor into that by becoming/re-assuming the position of his cheerleader, while dealing with the fallout of her husband's death and the struggles surrounding her in-laws. I presume the two of them will help one another through all of this, but this has the potential to get rather heavy, even with the light touch of comedy and the clear ecchi elements.
Finding that balance and keeping the pacing will be key.
Thanks for the TL.