Sadly android obfuscates a lot of files, including save files from games. Unless your phone is jailbroken, you can't access these.
Yes, I already found a solution. I was forced to get root and then I found where I could copy the save.
To find the folder you need any explorer that supports advanced search with root.
/data/data/wataponno.com.Wataponno.MagicalMonstergirlsAcademy/
This is where saves should be stored if they were created.
just move them between devices and that's it