 If you liked
Satougashi no Dangan wa Uchinukenai: A Lollypop or A Bullet
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 ...then you might like
Dead Dead Demons Dededede Destruction
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Little girls that go through life-changing events, DEDEDE being much MUCH weirder and more obviously fictional.
Both manga have a stay-at-home brother who does nothing but lays around and plays videogames but is shown in a very positive light and helps his sister and her friend go through this troubling time.