A turn-based Touhou Project gacha RPG for smartphones that launched in 2020 in Japan before a global release on 11 May 2021. It follows a player-named girl, ostensibly from the Outside World, who unexpectedly finds herself inside Gensokyo, carrying a journal which only she can open and read. Upon meeting a handful of the main cast, it becomes apparent that her abrupt appearance is linked to the phenomenon of Seal Crystals popping up all around the region...and thus begins a new, cross-dimensional incident.
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This game provides examples of:
- Call-Back: Countless ones to Touhou's canon games as well as its various spinoff manga, such as Reimu bringing up one of Meiling's very first lines in the series about "shrine maidens being the kind of humans that are okay to eat" in Touhou Koumakyou ~ the Embodiment of Scarlet Devil when they meet up in the Prologue.
- Color-Coded for Your Convenience: Each Mook's hair color indicates the essence it is associated with: red for fire, orange for metal, yellow for star, green for wood, blue for water, purple for moon, brown for earth, white for sun, and black for non-elemental.
- Deal with the Devil: In Chapter 2, Marisa is revealed to have made one of these in the past to have enough power to stand side-by-side with Reimu, with the payment being her name and the disappearance of Reimu herself.
- Elemental RockPaperScissors: The game features an elemental system with eight "essences" - five based on the Eastern elements (Fire, Water, Metal, Wood, Earth) and three based on celestial objects (Star, Moon, Sun). The latter three follow a simple pattern (Star > Moon > Sun > Star), while the former five interact based on the Eastern elemental system: each essence resists the essence it has a generating interaction withnote and is weak to the element it has a overcoming interaction withnote . Most friends (except a select few whose affinities are based on Logical Weakness instead) have two essences, one from each category, relating to their abilities and personality.
- Featureless Protagonist: The noncombatant player character, who is never shown. Note that her input name differs from the player's account nickname, yet both will be chosen and can be customized later.
- Laser-Guided Amnesia: In chapter 1, the Lost Word of the chapter, Hakurei, causes the heroes to forget the word upon entering the corrupted Alternate Universe, and as a result end up forgetting Reimu's surname, including herself. Remembering it becomes crucial to resolving the incident, and luckily, the outsider's self-recording journal has a form of Ripple Effect-Proof Memory and retains said surname.
- Level Cap: Initially, 70 for each Friend. Limit Breaking (a la Azur Lane) a girl with either a duplicate of her or a consumable Paper Doll successively raises her cap, up to a maximum of Lv. 100 after all three breaks.
- Memory Jar: In Chapter 2, the Witch of Scarlet Dreams sealed her memories into a Seal Crystal that she entrusted to Flandre for safekeeping 1000 years ago, to be returned to her once Reimu returned to the world.
- Play Every Day: As expected of a gacha. Apart from login rewards, daily tasks, and weekly checklists, the game's repeatable Errands (a near-copy of commissions from, once again, Azur Lane) serve as a rare F2P source of the game's two summoning currencies, Seal Crystals and God Crystals, with the latter's status as costly premium currency making them specifically vital to those interested in acquiring costumes, expanding the school and dojo, or rolling guaranteed Friend ten-packs.
- Power Incontinence: In Chapter 2, Marisa suffers from this after having her name sealed away along with that world's version of Reimu in the past, resulting in her becoming the Witch of Scarlet Dreams.
- Really 700 Years Old: Sakuya, despite being a human, is somehow still alive in the parallel world of Chapter 2, despite it taking place one thousand years into the future. Sakuya herself refuses to offer an explanation for this. Given that the last thing Remilia did was give one of her fangs to Sakuya before facing the Witch of Scarlet Dreams, it's implied that Sakuya became a vampire herself.
- Say My Name: Applied, to an extent, to resolve the incident at the conclusion of Chapter 1. Reimu stoutly declares the surnames of Marisa, Sanae, and Yukari to relay to all present that nobody, including herself, can recall her own. The outsider's self-recording journal retains said surname: Hakurei - that chapter's Lost Word.
- In the climactic battle against the Witch of Scarlet Dreams in Chapter 2, Reimu calls out Marisa's name, that chapter's Lost Word and the true identity of the Witch.
- Space Elevator: The Scarlet Devil Tower in Chapter 2 is so tall that it extends all the way to the moon, where the Arc Villain Witch of Scarlet Dreams resides, making it a magical version of this.
- Wake-Up Call Boss: Yukari at the close of Chapter 1. Whereas newcomers could thus far skate by with minimal obstacle, Yukari, for any party not purposefully bulked up, requires timely deployment of the game's combat options, chiefly Barriers and Spell Cards. Elemental advantages will also greatly benefit, for Friends such as Reisen.