If someone who can use the Impure World Reincarnation jutsu is introduced into the game, sure. She's dead by the time this game takes place since it starts within the time period of the original.
i did not see the answer if it was answered but will Hanabi be part of the girls in Ark 2,3 or 4? also while i don't care about NTR, the only NTR is you pretending to be Asuma to Kurenai. but it ain't true NTR since she thinks she is with Asuma. (Half NTR?)
also only played 1.07d and i ported my save from 0.17 or 0.18 to v1.01b-pc then v1.03c-pc then v1.07d-pc. don't remember 100% but it works. did not get an obvious bug. tho the battle system does not appear to level up much... (the percentage don't change for difficulty no matter the level.)
on the passive make it easy to see the level of the characters and a little explanation on what levels do. this was probably over looked in v1.07d-pc. i know the old active battle is coming back so...
leveling them up by hand would help and your old items would be of use.
on passive it is luck, on active it is skill. so a 40% chance battle could be won with skills if you have them. 90% would be someone who is appropriately qualified and 100% is "over qualified" as in impossible to fail.
also i usually wait for a c or d version to come out and test since i am on Linux.
on the feedback on art... the lines are thick and dirty and details like feet and other small/fine parts looks like the sketch version instead of the "final" versions. working fast is fine as long as revisions are "on the table for later". don't worry, this is the BEST Naruto hentai game and even the best looking since it is about 80% to 90% true to the original art. (not everyone is REX from Narutopixxx even him self isn't recently...)
NTR is more of an is or isn't fetish. In this case, she is still faithful to Asuma on a technicality because she believes it is him, but if she was knowingly having sex with the MC without thinking it was Asuma, it would be cheating and then adding her to the group would be NTR since the MC has stolen her away, Netori specifically because the MC is the one taking the girl away.
Pretty sure Hanabi has been mentioned as a yes or a maybe in arc 4 to allow use of her Boruto form. Her other forms might get this game canned on multiple sites Speed uses, she would be considered a loli in most of her appearances outside of the transition into the Boruto era and the Boruto era itself, which is a no tolerance no no on Patreon and is a case by case issue here.