GUIDE TO GET ALL ENDINGS (dear game dev, if this is not allowed pls tell me, i'll take down my comment)
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Last ending requires you to get the other four endings. Most efficient way to do it is this:
(make sure to press RETRY, DON'T go back to title)
1: Touch leg. You'll see the cursor change to let you know where it is exactly
2: Talk to boy, make one of three teas
Repeat for 3&4, make sure all the teas are different
5: Talk to boy, then click on bag