Touhou Shinjutounote ~ Hollow Song of Birds is a Touhou Project fangame developed by raichu, ido and Shijimi Nono and written by Milka Oyasu for the Danmakufu engine. The first trial was released on May 12, 2018, with the full game releasing later in January 28, 2019. The most recent version, v1.12, was released on July 11, 2019. Despite sharing the same universe as many of the developers' previous games, the story stands well on its own, and it's not required to play the older games to understand this one.
The primary gameplay feature of this game is the use of different colored gems to modify your character. In addition to the playable characters Reimu, Marisa, Sakuya and Kaguya, each can choose one of seven different colored gems that encourage different playstyles depending on which one you pick. Some are more for dealing extra damage, while others give benefits to your resources or movement. Some gems mesh better with certain characters, but the variety allows for a fair bit of customization and experimentation.
Time appears to have stopped throughout Gensokyo, freezing both humans and youkai alike in a sort-of stasis and only leaving a select few untouched, taking the color in the environment with it. Among the unaffected was Sakuya, whose time manipulation powers allowed her to avoid the freezing. Using her powers to unfreeze Reimu and Marisa, the group departs to take on the mastermind responsible for freezing Gensokyo in time.
This game contains examples of:
- Anti-Villain: Horou only agrees to help the Big Bad so that she can find a way back to the Outside World to reunite with members of her species, the endangered crested ibis. She lacks any sort of malice, but it doesn't change the fact that she's technically responsible for this current incident, having frozen time on Set's request.
- Boss Rush: The extra stage has you fighting all but one past boss at some point, with all of them eventually coming together at the end for the last spell card.
- The Cameo: Mystia appears as a Stage 5 midboss as part of a favor for the Final Boss, the latter apparently being a huge fan of Mystia and Kyouko's band, Choujuu Gigaku.
- Chuunibyou: Hikariko is vaguely referred to as one in the music notes, and it's not hard to see why; she's an asocial wreck in-person, but puts on a facade of confidence and arrogance while she uses Chirper.
- Cult/Scam Religion: The Youkai Land Buddhists are one very loosely based on the teachings of the Buddhist monk Shinran whom their leader Shiran was allegedly a student of, gaining the following of various anxious youkai in the process, including every other boss sans General Set. Their beliefs revolve around the idea that reciting the nembutsu (a chant) just once is enough to guarantee salvation in the next life, allowing for one to live life however they want without needing to take others into account. In truth, Shiran is mostly interested in power and money.
- Death Seeker: The Extra boss Mumei, after being freed from Set's control, convinces most of the previous bosses to cause another incident in an effort to get the heroines to show up and exterminate her. They wind up working to try and restore her will to live instead.
- Deliberately Monochrome: When the world gets frozen in time, all the color gets drained as well.
- Egyptian Mythology: The Big Bad of this game is none other than the Egyptian God Set, having set up the plot of this game as part of an elaborate revenge scheme against fellow God Horus.
- Fictional Social Network: Chirper, a thinly-veiled parody of Twitter that's exclusively used by bird youkai and Shiran's followers.
- Gender Flip: General Set is a confusing case, being spawned from the merging of a male God's body parts and a female seto-taishou. Ultimately, however, the character itself is still considered male.
- Maniac Monkeys: Ranran used to be a vicious youkai with interesting culinary tastes, but after killing humans was outlawed she became a rather nonthreatening dye shop owner.
- No Social Skills: Hikariko can only exhibit any sort of confidence through Chirper, otherwise appearing as extremely timid and antisocial, generally falling somewhere between an Otaku and a Chuunibyou.
- Peek-a-Bangs: Mumei (and subsequently General Set) has white hair that covers one of her eyes.
- Production Throwback: Reimu's Good Ending has Horou borrowing the Book of Lemengeton from Fuma Mishandra.
- Secret Character: Kaguya is a secret unlockable character, obtained by clearing the game without continues.
- Self-Duplication: The second boss, Chii, has the power to do this as seen in her Spell Cards.
- Time Stands Still: The primary feature of this current incident.