Why Dazai, though? I get it, they wanted to suicidal, cynical, disillusioned character, but why take a famous writer? Why a writer even? I am curious to see if that will add anything in the next 1 maybe 2 episodes, but I doubt it will.
Otherwise it's... Felt very rushed, and kind of jumping from normal ecchi isekai humor to somewhat dark humor, as if it did not really know what to do, and what to be. Ecchi elements felt especially off-putting, because they simply did not match the narrative and were forced. If it was all (dark) humor from the get-go - then maybe it would match better, but as it felt "too scripted", as if they had a plan: we make a joke here and here. It also does not help, that Dazai does not look like he is serious in most cases, it looks like he is actually joking about death, rather than really wanting to die
In addition, him being only 1 HP does not match with the story, that follows. It does not make much sense, that him being grabbed by the tree into a choking hold would not deal any damage at all. Or maybe it could, if it's completely like a game, but... It feels off. It feels like 1 HP was added only to make him look even weaker, rather than to provide any actual danger to the character.
Again, I will give it a chance, but am not feeling it so far.