the summary ---> cloverdays.exe should be fine, delete install.exe and you are good to go
I don't like strings that are present in install.exe while running scan in IDA, alternatively you can spot them in HxD too.
They are sign of
Crypto++ used in the program, but isn't it unity game? Why it needs AES>?. Nothing too scary, but why installer needs it? I mean I coudn't unpack .reSS files or .dat files to get CG gallery ( btw if you have all CG's extracted, upload them pls. like here: hitomi.la, I'm to lazy to take ss ), so maybe they encrypted them XD Idk I'm too lazy to check that. Virustotal now have 33 detections out of 71 anti malware softwares on installer and in advanced tab you have some interesting stuff going on. I ran game on VM and it didn't brick it.
It seems like its sticked to the end of exe, look at the left top (installer.exe) and then right bottom (game.exe). Idk i'm not gonna check it further. I guess game itself is clean, but I'll run it in VM Ware.
I won't analyze it myself but if somebody here like reverse engineering I want to hear from you what you found

//Also I don't recommend taking advices from people on the internet, if you feel like this is security risk, and you don't know what VM is, just buy the game. Here is the reminder:
Yeah and I checked process hacker and it seems that the game exe is fine. It does not spawn additional process and internet connections.
Ok I scanned the Virtual Machine that game was running on with ESET online scanner and Kaspersky Virus Removal Tool, since I don't bother to create accounts and deal with other scanner bullshit. It seems to be clean. (The game itself)
I went step further and fired up Wireshark and Network Monitor 3.4 to check if game is connecting to some random stuff in the internet, and it's clean. Also checked netstat -ano
I may got into this a little bit more than I expected xD It really seems that game itself is clean. You can test it your self. For me it's enough to trust that only installer is dirty. I downloaded worse things, not running any checks and putting trust to my anti malware solutions and my brain.. so yeah XD