Due to the sheer abundance of foreshadowing in the game, an entire page had to be created to keep track of it all without bloating the main page too much.
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The game's world
- When Hiyoko decides to go for a run on her first day of summer break, one of the things she passes is the post-apocalyptic remains of a city.
- If Hiyoko doesn't properly bond with any of the birds, she is executed by a group calling themselves the Hawk Party, with them stating that she was meant to be a goodwill ambassador of humanity.
Pertaining to Shuu's plan
- In Yuuya's route, the infirmary seems to run out of cleaning supplies really quickly. At least, it's foreshadowing if you haven't played Shuu's path yet.
- Anghel's rambling about "demon spores" in the infirmary. The Giant Space Flea from Nowhere boss fight at the end of his route has Shuu, affected by Anghel's chuuni perceptions, summon Rufa, the Tree of Blight. This may be an Anghel-ized summation of his plans to spread the Charon Virus.
- A recurring theme of Ryouta being sickly, with Hiyoko in particular stating that Ryouta always feels worse after visiting the infirmary. BBL reveals that Shuu has been purposefully sabotaging his immune system so that he could infect Ryota with Charon Virus, which can only survive within immunocompromised birds.
- File No. 7, the note you get by completing Ryouta's route, informs us that someone is planning to make a student into a carrier of some kind of disease. That someone, as revealed in BBL, is Shuu, who makes Ryota a carrier of Charon Virus.
- Oko San's fantastic speed and a strange concoction that Shuu makes him drink. At the end of BBL Shuu pumps Ryota full of performance-enhancing drugs that would allow him to fly around the whole world to spread Charon Virus, with the implications that he has been testing them on Oko San throughout the main game.
Pertaining to Yuuya
- When Hiyoko calls Sakuya a wannabe aristocrat, Yuuya hesitates before responding that he is a fullblooded noblebird.
- Note No. 11 tells about a Dove Party agent operating inside the school. Bonus points since the way to reach this note is to play through the route of Yuuya's brother, Sakuya.
Pertaining to Nageki
- Note No. 8 in the archive tells about a fire in an underground facility, with "Subject 00"'s body being in cold storage. As revealed in BBL, Subject 00 is Nageki, who burned himself alive, not wishing to harm anyone or be used as a bioweapon. His body is preserved so Shuu can later infect another student with Charon Virus.
- When you first meet him, Nageki comments that he’s been waiting for the books Hiyoko is returning all summer. She asks him how he could’ve done that since he’s a first-year. As a ghost bound to the library, he’s been a first-year for some time.
- The library is always oddly cold. In mass media, abnormal cold often signifies a paranormal activity's presence.
- Nageki tells you that other birds tend to ignore him even when he comes near them. It could, at first glance, seem to be a nod to his quiet nature or, as Hiyoko assumed, him being mistreated by other birds. In reality they quite literally can't see him because he is a ghost who only a select few can see.
- If you suggest Nageki read "Night on the Galactic Railroad", Nageki says that he likes it.
- If you choose to talk to Nageki during the school festival, Hiyoko tells Nageki that he is "kind of like a friendly ghost".
- If you visit the library during Anghel's route, Nageki would act surprised that Angel talks to him, as he is a ghost invisible to normal people. Additionally, Anghel addresses Nageki as "Textoris Melodia Funerus" note , the same nickname he gives Ryota in BBL, foreshadowing the reveal of Ryota and Nageki both being carriers of Charon Virus.
- Note No. 3 is an entry from Nageki's diary that tells us about a time Nageki woke up in a location different from the library, strongly implied to be the underground medical facility he died in.
Pertaining to Kazuaki
- The fact that Kazuaki smells of bleach. In the main game he brushes it off as having fallen asleep in the washing machine, but the BBL route reveals him to be a dark-feathered quail that bleaches his feathers in order to hide his identity.
- Kazuaki's blacked-out photo of someone important to him.
Pertaining to The King
- One of the notes you get for completing a route states that Subject 00's relative is confirmed dead, with his remains being preserved in the lab. BBL reveals Subject 00 to be Nageki, with the aforementioned relative most likely being Hitori, since all other family Nageki had is long dead by the time he burns himself. However, these remains can't actually be Hitori's, since he's alive, only operating under a fake identity now. Most likely, he used the original Kazuaki's corpse, disfiguring it in some way to make it unrecognisable and passed it off as his own dead body.
- In Holiday Star, you can have a New Year's date with the main cast, with this feature unlocking after you complete the first chapter. If you choose to date Kazuaki, he acts wildly out of character, being a literature teacher while normally teaching maths, constantly bursting into tears instead of falling asleep every five seconds, and mentioning Hitori as a separate person from himself. This gets even more alarming if you play through chapters 3 and 4 after Kazuaki's shrine date since The King behaves really similar to the OOC version of Kazuaki presented there, being extremely timid and Prone to Tears as well as having an affinity for books.
- Additionally, in his New Year's shrine date Anghel makes a vague remark foreshadowing the true nature of Holiday Star as a twisted Eldritch Location hiding behind the guise of a dreamy paradise land in order to attract troubled souls and consume them. Alternately it may be a reference to the third game, "MIRROR", which is in Development Hell.Anghel: (to Hiyoko) "A creeping dread, a growing malaise...or perhaps, a light. ... A world is but the light reflected from a fragment of the broken mirror. The fragments write out the destiny of every star in the heavens. Is your Azure Soul satisfied with the world and the fate you see before you now? Or perhaps it has been charmed by the fate written by a different shard of the mirror. If that is the case, then I shall..."