Unity - Spending a Month with My Sister [v.2025.09] [Yakumo milk]

Nice art regularly updated. A daily life of brother and sister lewdly living together .
A little bit grindy but worth it. The scenes are so well made and smooth.
Will be love by those who love renaway girls >o>.

This game have potential, simple, nice graphic, ect. But the only default is the translation is not really good but enough for appreciate the game. I recommend this game to those who do not like erotic games with a story that is too complicated for nothing. Can't wait for the next update.

unless you read japanese this game is difficult to play, you only get 20 days in game to get an ending of your choice. energy runs out fast, money is slow. unless you use a cheat engine this game is not enjoyable in the long run.

It is well animated and plays smoothly. My advice would be to just stat dump into a love ending or lust ending, if you try to balance your stats then you get the normal (boring) ending.

"Spending a Month with My Sister" is a RenPy adult game with sweet drawings and smooth animations. Without giving too much spoilers, basically, you got one month to shag your younger sister you haven't been seing for the last 10 years and you need to do your best in that limited time to seduce her and win her favor (or refer to some pseudo science solutions) to reach your goal. A kinky story i'm sure many of us can relate to.

The game design is kinda like any other RenPy, but it wants to be more than that. Or so i think because i don't have much experience with Japanese RenPy games. Despite the obvious effort though, it fails to be what it wants and falls into the mediocre side with many of the RenPy games on this website. It borrows some mechanics from the famous game Koikatsu, i think, again, im not very experienced with J-RenPy games, but implementations of the said mechanics were inadequately applied at best and you can't shake the feeling that game itself has been rushed to meet a deadline or something.

I got another shocker for you. Since this is a Japanese game, it requires a third party auto translation program, and uncensoring patch that some users here put their hearts into it. Unless your kink is staring at pixels, not understanding what's going on while people are having sex, just like in real life, you gonna need those patches. Translator is still not enough to understand everything, but it's still better than looking at a language you don't know anything about. Some conversations are so bad it's hilarious. And really, you gonna bad mouth the translation while you're laughing your arse off? Because it got you outta the mood? Come on now.

This is a semi decent incest game. for me, at least. There are some things that prevents me from giving this more than 3 stars and i'd like to mention some of them.

1) Game is extremely grindy. I needed to hack the game with a hex editor to get unlimited money and energy to focus on the relation ship, but got the same ending twice in a row.

2) It has little to no hint system and requires you to keep up with an unforgiving tempo. You got 30 days to get on with your goal. Like many of the Japanese games you are expected to accomplish the impossible. One undue chore or one wrong move maybe gonna cost you the ending you desire. You have to make the most out of your days to get certain things, do the right chores and that time frame is absolutely not enough even if you run a perfect game.

3) If you think about it, the unforgiving limited time is a gimmic that supposed put pressure on you to feel left out of other things you could have done so it wants you to play the game again and again after every 30 days, restarting it from scratch. Which would be fine if it had more content, sex positions, encounters etc but it's not there.

If the game theme is to your liking, give this one a try. If not, stay away from it. Hope it helped. Stay safe and good luck to anyone who made here without rolling their eyes in disappointment

You grind a lot in this game, if you want to get the true ending, and the developer didn't make it easy for you. If you don't have a guide, you won't make it the first try. The every live in isn't really develop. You don't have a lot of interaction with her. The H animation are good but not great. It's like the flash animation. Really limited and they are not many.
But it seems this is not the final version. The game is still in development. Hoping the dev add more silly interactions.

For what this is, it was great, and I'm glad I didn't let the older low-star reviews deter me. It's not trying to be a tipple A MMO sandbox mega fuck game. It's also not a simple flash loop. It's a solid H game, enough "game" to get you engaged, and wonderful "H" to make it worth while. It could be a bit grindy to some, but I don't think it's too bad. I was never confused on how to get to the good content. I played through it twice in... oh, 3 hours? Not a tiny title, but not a slog either.

What is the content? A number of well animated and drawn sex scenes with MC's innocent younger sister. Foreplay, hand jobs, oral, tit jobs, missionary, cowgirl, reverse cowgirl, tied up vaginal, etc., watch until you're done, multiple speeds, infinite ejaculations, etc. - AKA, great wank material. Idk about everyone else but that's what I'm here for so, 5 stars, it's going on my list.

Oh, and I thought the translation was fine. Yeah it's not perfect but if you've played any translated games before, you'll laugh at claims that this translation is bad (imo). Maybe it's progressed since the older reviews were written.

Dont be fooled by the ratings... I think the objective of this game is to drive you nuts with the grind... Never seen this amount of grind for peanuts worth of content. After grinding for about an hour I have seen zero content while painstakingly cleaning the room, working, eating and talking .

Interesting game! Cute and nicely drawn girl, but there's no proper english translation, so we're stuck with mtl translation

gameplay wise it's your typical lovely dovey house stuck thing, but the game ends every 31 days without new+ start whatsoever, hoping the dev would update the game!

the game is actually pretty good there aren't many scenes because the game is still in development and i like that cus i loved the first version and i can't wait to see more of it, the only thing is that the translation isn't very good but i can accept that cus it's better than you can still know or comprehend what the game wants to say

This game has great potential and replay value! Not very difficult but not mind numbingly easy either. Kinda grindy, but I personally like "earning the scenes" especially if they are good, or you can access good ones early if you're clever. Already followed the developer and I'm excited to see more!

P.S.It does need a proper translation though, hopefully someone is doing it.

The art is exceptional and this game has an immense amount of promise. I'm hoping they add some darker routes(ntr/netorase or DP) but I am doubtful. Regardless I can't wait to see what this looks like after a few updates.

Like everyone says, the translation is quite bad and laughable. However, it's enough to get by honestly and if you don't really care about the plot, you'll be fine. The game is quite a grind as you won't get any lewd scenes till day 20ish. I enjoyed the animations and there are a decent amount of lewd activities you can do.

If you want a similar game, check out Sister! Seikatus -Fantasy-

Edit: Gave the game another star as the game is getting monthly updates and the translation is more or less fixed with mods.

I feel like the dev is cashing in on a popular H game genre at the moment rather than actually having a driving passion behind this sort of scenario/style of game.

There is really nothing special about this one, except nice animation and art. I feel like I wasted my time by spending 3 hours playing this through start to finish. You pretty much just go through a normal daytime routine and then suddenly once a quota is filled you can just get a blowjob/have sex. There is no real lewd build up (I've read through the entirety of the dialogue in my playthrough) no cut-ins or CG to show brother sister hijinks. There's not much to show their relationship building at all if I'm honest. Only numbers and one off (non-lewd, only dialogue) events once you hit a quota.

There are Practically no ecchi moments in the game either other than having a bath with your sister. You're basically either not having sex and doing chores or you are having sex, that's about as in depth as the game gets with arousal. To put it simply there is so much wasted potential here... It's a shame really.

In short, If you enjoy other sister cohabitation games this one is lacking in comparison. The majority of the game play feels detached from the actual porn side of the game as though the game play only exists to impede your journey toward sexual scenes, which are mostly just penetration at this point anyway.

Really great art and animation, but If you don't speak Japanese I recommend not playing this game. Half of it is translated, and the other half is not. The parts that are translated are butchered to all hell, and it's almost impossible to understand and follow the conversations. Even some of the choices are confusing to read.
I'm sure you can figure everything out once given enough time playing, but ultimately it's not worth the hassle. There isn't an INSANE amount of content here.
If you can speak Japanese, then great; this'll be a nice game for you. For the rest of us though, not worth the time...