If you are playing Crimson Colosseum and looking for the true ending of the game, all you need to do is just to follow this guide and help you to get the true ending
Guide to True Ending
on day 7 you must see the scene in the red light district in a corner at midnight.
the next day you must talk to risky when you wake up and tell her that you saw her, then at midnight you must see the scene again and stop her.
on day 15 you must go at midnight in main plaza and talk to the succubus that appears.
before day 20 you must defeat all the bosses.
On day 20 if you have done everything right an event will be activated in the kitchen that you must see, then you must go to the red district in the day and talk to the succubus and then go to the coliseum in the hallway next to the pervert who always touches sachi, the soldier will let you pass.
Now you only have to talk to the character in the hood ♥♥♥♥♥ and you will have activated the true ending.
Tip with the witch: you must use the void perfume to defeat the witch.