2. If you ever get confused over whether or not you are lesbian/gay because you feel possessive/obsessive towards your same sex friend despite having no sexual desire to them, this anime is also for you. Loners or introverts often feel this way towards their only friend because they don't have many friends and they don't want to lose them, it's a common occurrence, not a sexuality.
3. If you ever get confused over whether or not you love someone romantically just because you admire your same sex friend and want to be close to them, this anime is also for you, because this is normal common thing in friendship, it's not a sexuality.
The only reason this anime have high score is because a lot of the audience are women (obviously), and sadly, most of them do indeed empathize with the characters because most of them are like this. though they may fail to see which part is realistic and which part is fantasy. in a way, this anime is very woman, because most of them don't know what they want, and they can be deliberately shallow and have savior complex, they want to be loved but they keep falling for some version of toxic men, just like the character in this anime.
To be honest this anime is just a normal drama to me, these things happen often, but obviously not so sweet like the blatant female fantasy that happens in this anime. For example, the protagonist thoughts and characters are relatable to most women in real life, but in reality big musicians do not fall in love to their groupies. Hachi's sentiment about the desire to shallow fancy things (trendy clothes, big house, fancy food and furniture) in life is real, but the scenario of multiple hot men genuinely falling in love to a woman who has weak resolve to commit is not real. I mean, lets be real, Hachi got pregnant 6 months after being away from home, that's a shorter duration than the pregnancy itself, in real life women like this are the type who are either crying in abortion clinic or the struggling single mothers desperate to find love, men do not like them. In real life men do not like Hachi.
As for Nana, a lot of loners in real life share that sentiment of possessiveness, attraction and fear of losing towards their friend, but in this period of time where people think personality trait is a gender, they can easily mistake their love towards their friend as a hint of their unexplored sexuality, while in reality its not sexuality unless you feel sexual desire. It's only that they feel like they don't have any other better friend and afraid of losing them, this happens often, and is actually normal, just like how it's portrayed and told in the flow of this anime. Nana and Hachi are not confused bisexuals, they are friends having sentiments often happen in friendships.
I see negative reviews, and I actually agree with them, though many are written by men and they probably don't know the core traits of women is to be completely driven by love and to succumb to it, Hachi is a stupid shallow woman, its only natural for men to not be able to empathize with her, this alone proves that men indeed do not like women like Hachi in real life, so this anime is still far from realistic. The only realistic part of this anime is just the flawed thoughts of the female characters, also the common daily life drama like cheating and break ups, which isn't an impressive drama, story wise.