Idk why people are so worried about an incest route. We know he finds her cute, but there's no indication that it's romantic. And even if it was romantic on his part, by the time Hari reaches marriage age, at least 17, that would be a combined 30 years of seeing him as a brother. You don't suddenly gain romantic feelings for your brother 30yrs later.
Edit: Nevermind, found out this is from the same author as wmmap. Now wonder it's so tragic. ML could go either way :sigh: