In the narrative world there is a few concepts.
In western media it's 'grim dark' - excessive grays and browns, hyper violence and 'no good people' tend to be tropes played out over and over for some bizarre take at 'realism' that drifts into Clockwork Orange levels of stupidity very quickly.
In Japanese media it's 'depressing' - prostitute love interests, abusive mothers, psycho girls obsessed with some loser, etc. In an attempt to portray 'realism' they turn to caricatures, black and white mentalities and lean heavily on 'misunderstandings' between characters. The authors often mislead or give vague hints onto the characters actual actions. Common japanese romance tropes are also included, love triangles, sleezy pickup artists.
This manga is so no different or innovative from it's peers. It tells a basic story of a poor boy with a hooker for a mother, trading pennies for companionship from a rich girl who allegedly whores herself out under a bridge to feel some semblance of 'power' over her controlling parents. There is a love triangle misunderstanding girl involved, the main character is meek, and it's predictably unclear if the main love interest is actually a prostitute. (though a recent chapter showing her with large piles of cash and mentioning she keeps MC's money 'separate from the others' suggests she is.)
This manga will follow a predictable branch of two or three paths.
1. Main love interest pampers MC, he is in love; he sees her with a man. Either old salary gentlemen or tanned blonde guy - this causes a misunderstanding OR if it's going for HYPER REALISM will be exactly as it appears. The two struggle to find meaning to their twisted relationship; if she is actually a hooker they'll end up together.
2. Weird love triangle girl wins in the end because MC and hooker love interest could never work out. Flashbacks at end of the good times they spent together, they cross each other in a busy street. MC looks back, she doesn't.
3. It never ends, they just constantly fall into misunderstanding after misunderstanding for hundreds of chapters till everyone drops it.
All that said, it's not a bad manga. Cliche, generic and perhaps a bit excessively 'deep' it will fill time for those who like the seeping dread of the MC being used and abused by those around him. Those who self insert into characters are better to avoid, depression lies ahead.