Superb start - two adults, although quite quirky in their own fashion, got into relationships. AT THE START OF MANGA! WTF? Am I dreaming? Wow, what is it? Growing, steady relationships, with pinch of getting knowing each other better bit by bit? I'm in heaven 11/10, would read again.
But then... We get to know that MC has mental age of about middle schooler. Your girlfriend, that you cohabitating 2month with, ask you for sex. On Christmas Eve. And you think it's not special enough ocasion? What is wrong with you bruh? Did you mom drop and left you on piece of ice in your childhood? Oh right, this shit is Japanese, so MC is 146% useless beta fucboi. Ok. 6/10, would give it a chance.
And then we start getting forced drama one by one. SUDDEN childhood friend. Whole "Oh noes, our whole relationships are just fetish based, it's bad!" and getting at each other nerves, cause they both having withdrawal syndrom. Great plottwist bruh! 2/10, drop is near.
And here comes the worst bullshit move ever. Omega forced TEH DRAMA, with loud *BANG* she close door behind herself and goes to, where exactly? She lived with him for half-a-year already no? Well, most likely she went to parents home, who cares. Or maybe some Ugly Fucking Bastard is here, cause you know, MC doesn't satisfy her in bed, fucking beta-trash. MC got drunk and almost got laid. WOAH, is he at last get some balls? Mayb author grew a pair somehow? Nope, he went sage mode "No, I can't!" and bitch went laughing at him "You fucking what? Didn't fuck your girlfriend for three month, while sleeping in same bed? HAHAHAHA". So here it is 1/10, regreting not droping it before this point.