This manga made me tear out my hair.
It starts with Tsukasa moving in with Haruka, a girl who is 16 (I think), and Tsukasa is 11 years old. She thinks it's cute that she has a little brother now. Until he ties her up, gags her, throws her on the bed, starts undressing her and was about to literally rape her, until someone disturbed them. Haruka doesn't do anything about the attempted rape.
I knew then this was going to be a stupid story. Who in the world just brushes off an attempted rape with a stranger? You'd press charges! You'd be emotionally traumatized! But not Haruka, no, it was just her little (new) brother, after all!
Then comes another attempt at rape, and more .. and more. Tsukasa is very aggressive, and we have no idea why - because he just met the girl. We also have no idea why in the world Haruka is allowing this. He soon starts saying stuff like "I really love you!", while trying to rape her. For some reason, they end up being boyfriend and girlfriend after a week of living with each other.
The story comes at a standstill at that point. All Tsukasa does is try to kiss Haruka, but Haruka keeps going "Hnn..." because she doesn't like it (and even clearly states so). Doesn't matter, because Tsukasa kisses her like every day, and keeps groping her. She doesn't like it, of course. This continues throughout the entire manga - nothing changes about their relationship.
The furthest their relationship takes is that Haruka gets jealous if Tsukasa kisses another girl. That's it. They're still at the kissing stage that Haruka really doesn't like at all. Tsukasa makes it clear he wants sex, and Haruka makes it clear she hates kissing him. Tsuaka eventually noticed that she never wants to kiss him, and for a second I thought the story was going to move forward because he asked her if she really hates kissing him that much.
I was wrong, the issue was glossed over and never addressed again and nothing changed. She still hates to kiss him, and he still tries to grope her whenever.
This manga is just the same thing over and over again, but just in different situations. The relationship between Haruka and Tsukasa never changes, he always tries to grope and kiss her (no matter how many times he promises to 'wait'), and she still clearly dislikes any physical touch (especially in public!). You could only read the first 3 chapter and have read the entire story of the manga already, because that's all there is to it. Just the same thing over and over again.
I suggest just reading the first 3 chapters to see for yourself, then step away from this manga. It's not worth your time.