Obtained: Speak to the Stood-Up Boy in Shibuya Station next to the statue.
The Stood-Up Boy is waiting for a girl named Momoko. After you accept the request, head to Hygo in Harajuku. Across the street from Hygo there will be a girl wearing a white/grey top and blue jean shorts. Speak to the Waiting Girl to find out that she’s looking for Hayato for their date at Daitama Observatory. After you speak to this girl, head back to the Stood-Up Boy and tell him to try Harajuku. Follow the boy to Harajuku to find him where the girl was previously standing. Speak to him to learn that Momoko wasn’t there. Head to Daitama Obervatory to find the girl standing on the south side of the room. Speak to her again to learn that they were going to see a movie in Shibuya. Head back to Harajuku to tell the boy to try Daitama. Again follow after the boy to Daitama Observatory and speak with him to learn that the girl again was not there. Afterwards, make the trek to Shibuya to find the girl standing on the stairs leading to the 106 Idolasphere. For the last time, head back to the boy in Daitama and tell him to try Shibuya 106. For the last time, follow the boy to the 106 and speak with him again to learn that Momoko disappeared. Her disappearance could only mean one thing…it’s time to jump into the Idolasphere and track her down! Thankfully we don’t have to go far as she is standing in the first room of the Idolasphere! Speak to her and tell her that he’s waiting outside then walk out of the Idolasphere and follow the purple marker to the east of the stairs to find the boy and girl near the map transition. Speak to them to complete the request.
Reward: Detritus x10