spoilers how to get them...
what i did is befriend Siri but go to Elenis route.
try getting all of siri interaction by going to lunch with him, fight club, class and stuff but dont forget about Eleni (intracting with her at class and lunch will increase her route).
for me dividing 4 classes by 3 ( 1 Siri, 2 Shared, 1 Eleni) for Eleni (Combat, Cryptozoology, History, Potions)
and siri (Astrology)
(Shared: Combat, Practical, Malediction) For individuly Spending time with them.
Then Stack up CHA for Eleni (pick all of her CHA option at her route) and STR for Siri. Eleni route will randomly pop up at morning and when siri suddenly Kabedon you at almost at the end
Say Yes
if your player recognize him bye saying his name that means your good ("Wait...Siri???)
if your player did not say his name that means your not good
Thats It! i hope this is helpful and Hope yall get the success ending