Yaaaaay thank you so much for playing, and for loving Yasha!!! 😢❤️💖😍 Yasha needs your love kekekeke
Can def help with Ending 12!! It has voice lines! Though maybe a bit sad huhu 😢 SPOILER ⬇️
Don't ignore Yasha, but do play normally/mixed playthrough/don't be too nice/suspicious - taking one of the routes that takes you to the final Yasha confrontation.
When see Sage at the convenience store, choose Not to comfort Sage. Don't talk to him privately/in your room (or just don't agree to the plan) and don't text Sage.
Then when Yasha comes to your house, don't strangle him or stay calm -- just run to the subway.
If you try to Push Yasha from there, because you didn't strangle him to weaken him... ;-; you get Ending 12!