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Well first things first, Takagi thinks Sato missed her period and thus is pregnant. This being Sato, obviously she is talking about something else missing, maybe the ring Takagi gave her in an earlier file? (It's missing from her left hand. Maybe the size was too big for her?) Also this pretty much confirms Sato and Takagi have made it to home base, because Takagi is sure the kid is his. If he hadn't gone that far with her, he would have reacted like WHO TOOK SATO FROM ME AND KNOCKED HER UP? The hanakotoba for false dragonhead flowers is fulfillment of desire, achievement. It seems that Toshinari's sister probably died after panicking about her stalker, that dead guy next door. Mr. Creeper almost certainly took those pictures where she isn't looking at the camera. To hide that Mr. Creeper stalked his sister (and thus the motive for murdering the guy), Toshinari took the creepshots and replaced them with the dead man's own pictures of himself, but didn't align them perfectly to the sun-faded borders. The creepshots were put in Toshinari's album; they are the pictures with the holes that used to be pinned to the board. Toshinari's MO was to probably stalk the stalker, and move into the apartment to get a shot at revenge. He's rich enough to get an apartment like that, but he obviously hasn't lived in it much since it's so barren and full of instant food and missing basic necessities like cleaning supplies. Ten bets the kid is going to be his alibi. I bet Toshinari put the fulfillment of desire flowers by where his sister died after successfully killing the stalker (he's been dead for a while if he is stinking).