On Birth Island, talk to (Visitor Guide) Arua's Fairy. Select dialog option 3: 'I don't know what's going on. Would you help me?', followed by 1: 'Great, knowing that would help me a lot.' and 1: 'Okay.'. Talk to (Visitor Guide) Arua's Fairy again, this time selecting dialog option 2: 'I want to know how to move and how to interact with other people.', followed by 1: 'Then, how can I run or walk?', 1: 'Ah~ I see.' and 1: 'Thanks, you're so kind!'.