Top one - you have picked wrong choices, it is not day related, if you pick correct choices it will lead you to this one without problem
2nd one - also you have picked wrong choices/skipped to read/skipped story/ its not day related, if you go with story and visit her apartament to ask for "bug" it should happen too
I literally told you, they can be gotten both on the same playtrough same as all scenes if you have at least "save" where you can load it, if you picked wrong choices, as for Emi scene it is a part of choice based event if you picked wrong, it will not happen. As for the "Oni" scene it may be "love path", it is a part of the "story" where you need to get "bug"once you there, you have to look for some, this scene trigger if you are going to her apartament to ask about them, simply if you have not seen it, you did something wrong.
