⚠️⚠️choice spoiler warning for E3 & E4, in case anyone wants to figure it out on their own:
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After the Stage 2 mark, choose all 4 options that show your interest in finding out more about Chao, including the kiss. Choose:
1. Dig deeper
2. They want to tell you something
3. There's something more
4. Kiss him/Let him kiss you
It'll automatically lead you to the branch leading to ending 3 and 4. "Pick your poison" is the line I used when you reach this part :) Enjoy!