I'm also pretty interested idk if theres enough people that play this vn that could stumble upon something so hard to find 😂
So I may have found said secret chapter... it ends up making a certain part glitchy with no character card confirmation when MC goes through the labyrinth.... hijinks ensues at he VIP room at the club..? idk it was kind weird and to get into that situation with a lot of dancing around choices to get there. Then again i don't know if it's because I also have access to the patreon updates... ~shrugs~