Nakajou and Miwa have no personality at all like someone else mentioned.
Nakajou fell for her because she literally "fell into his arms". Miwa? she's just a girl who likes manga alot with a "trauma". She as a person is defined by the events that happen(ed) to her, she has no personality. She also seems to be severely lacking in social skills. She has no relationships outside of Nico who personafies her. In fact Nico has more personality than she does.
By chapter 5 I can tell you alot more about who Nico is as a character than Miwa.
Nico is spontaneous. Loyal and abit cynical; being concerned about the true motives of others. Protective. Attentive. A part of the soccer club. Easily has conversations with others and can adapt/blend into groups. Abit stubborn. Has the ability to reflect on her actions and attempt to change. Likes fashion as noted by her need to "dress up" her school uniform.
Let's review who Miwa is: Likes "Sei-sama". Became "closed off" due to Inokura's bullying. Has seemingly barely ever been "outside" (river cleaning event). Runs away from people/problems. Talks more when shes talking to "Sei-sama" than any other character. Not aware of her surroundings. Has difficulty talking to people.
Did Nakajou fall in love with a sheet of paper? Because it's blank, thin, with no information or substance.
Its painfully obvious that the male lead is speaking to the reader rather than Miwa as a person. Because alot of his encouragement and advice is perfect for preteens in this age bracket.
"Love yourself more" "Stand up for yourself" "Be aware of the world around you" "Its normal to feel that way" " You have a right to feel the way you do." Its all very basic advice told in a very straight forward manner.
Nakajou and Miwa are speaking to the issues that the reader may be facing rather than being characters in a story. The only "characters" in this story are Inokura, Nico, Sano and co.
When Miwa describes her feelings to others she way its described is so vague that anyone can "relate" or insert themselves into that "feeling".