itch.io

For the Kira one, you need to choose the option to pull away from Joskue when you're cleaning up the mess he made in science class. When you take out the trash, you cut your hand and Kira asks you if you need help. Say yes and the ending will play out from there.

theres no specific thing that gets you the good jonathan end from what i can tell (like for example, kiras). but, the only thing i did different from my 'Out of Sync' ending from the good one was telling him what happened with dio? other than that, just pick everything he seems to like but doesnt make him uncomfortable, etc