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- The Boy (ボウイ) effect may hint at Sonoko being transgender or genderfluid.
- The way one obtains the Minus Screwdriver (マイナスドライバー) effect implies that Sonoko had hurt someone she loved.
- The picture that allows one to obtain the Minus Screwdriver (マイナスドライバー), the figure from which you obtain the Music Box (オルゴール) effect, girl in the hospital bed (known as Kangiku in her charset) and blond haired girl in Dark World are speculated to be the same person.
- Sonoko is suspected to be in love with or dating Kangiku. She is perhaps taking the bus to visit her partner in the hospital.
- The change in the expression of the girl who gives Sonoko the Odango (お団子) effect hints that Sonoko is trying to fit in as to not be mocked.