Hi, glad to hear you liked it so much! If you can tell us which CGs you have already, we can check which one you're missing and how to get there :)
Oh yea sureeee, I got the two CGs of Haruto and Kazuya, and i got the one where Shion is crying and shouting :D
You should basically be able to get it by always choosing neither Kazuya nor Haruto when possible, the missing CG should be Shion's epilogue :D
AJDKGEDQWYFKU TY IT WORKED