Oh this is rad!!
Scenario is by NRT (Takaki Nomura, the WNSP guy), music is by 辰凪刻子 (Tokiko Tatsunagi), character design is by 神門明風 (Akika Shinmon), and booklet design is by 凛風 (Rika? Rinka? dunno). Also NRT's new doujin circle is called Original History.
Storyline summary: ever since Easter this year, Gensokyo has been celebrating a variety of Easter traditions. (...Most people don't know what the traditions are supposed to be celebrating in the first place, but that's besides the point. Faith is faith.) Three months later, a bunch of strange little creatures called "ancestral sprites" (ie. undines, salamanders, kobolds, etc.) began showing up, and are seen as signs of good fortune. One night not long after the sprites' appearance, a thick fog rolls in, and...
...uh, everyone wakes up with cat ears the next morning?? And it's probably got something to do with the sprites, so our heroes pair up to investigate. Since sprites are only visible to people with an inherent affinity for them, Reimu and Sanae (who can't see sprites) are respectively pairing up with Marisa and Youmu (who can). (Also Youmu's ghost half has its own pair of cat ears.)
Stage 1 bosses are Orin and Utsuho, who are selling hot-spring eggs for Easter. Stage 2 boss is Atari Senpiki, a
kaji-ga-kaka (youkai from folklore that's a wolf disguised as a blacksmith's wife). She leads a wolf pack in the Bamboo Forest, and operates a smithy that makes stuff for the kappa engineers. Ability: agitating wolves by swinging swords. Stage 3 boss is Yukine, an Eagle Ravi squad member who's staying on Earth with Ringo and Seiran. Hanging out near an abandoned gold mine that the rabbits used for a base during LoLK. Ability: freely manipulating the size of her mallet. Each boss also has a sprite partner, foisted on them a few days prior by a powerful sprite from the Youkai Mountain. Utsuho has an undine, Atari has a salamander, Yukine has a kobold. Stage 5 and 6 bosses appear to have a gnome and... a sylph, maybe?
1. Overture of the Sprites
2. Pastorale of Grey Water ~ Long for homeland. (Partial remix of Old World)
3. Duet of Bird and Beast (Partial remix of Nuclear Fusion and Be of Good Cheer!)
4. Passion of a Sweltering Day
5. March of the Blacksmith in the Turmoil's Center
6. Rondo of the Sacred Gold Mine
7. Waltz of the White Mallet Rabbit
8. Chorale of the Basilica di San Cristisia
9. Intermezzo of (spoiler)
10. Nocturne of (spoiler) ~ Abyssal Xanadu. (Remix of An Instant Shorter than Planck and Schrodinger's Bakeneko)
11. Nursery Rhyme of (spoiler) (Includes melody from traditional song Toryanse)
12. Oratio of (spoiler)
13. Quintet of (spoiler) ~ Elemental Quintet
14. Finale of the Sprites
15. Fantasia of the Maidens (Remix of Necro-Fantasy and Necrofantasia)
16. ?
Album will be released on October 15, 2017.