The "?" hint icon does not show the hidden money sparkles in various locations.
If you were referring to bathroom, Kimochi's apartment, Asami's house or Interior restaurant, they were added in 0.4 version, for newly added places dev don't add hint so people may spend time looking for them. hints for them will be added in 0.5 (but for any new place added in 0.5, they won't be having hint "?" 0.6)
LMFAO on clicking on Chiaki and Nothing going to a funny link. Haha.
If you read the dialogues properly, you should know she is just 12, what else were you expecting, anyhow there are plans for making her 18, lets wait and see where that will go, https://extralife-nsfw.itch.io/extralife/devlog/367070/should-chiaki-become-lewd...