Touhou - Immaterial and Missing Power
Chronologically, it takes place between Perfect Cherry Blossom (TH07) and Imperishable Night (TH08). Henceforth it is referred to as TH07.5.
Immaterial and Missing Power differs from the other games in the Touhou Project series in that instead of being a Shoot-em-up, it is a fighting game with a heavy slant toward projectiles.
Immaterial and Missing Power plays like a fighting game in most respects. Two characters fight each other on screen with a variety of moves until one player runs out of health.
Besides a health bar, each player has a spirit bar, a spellcard counter, and a bomb counter. Each player also has a score.
While making preparations for the feast three days away, Reimu is distracted by a strange powerful mist that is covering Gensokyo. She and many other inhabitants of Gensokyo (such as Alice and Patchouli) go to investigate.
Suika Ibuki is an oni. Although legends say all the oni are gone, Suika has decided to reunite the humans and oni by attracting them through partying. Using her special ability to spread across the land, she causes the humans and youkai to have feasts and parties. The more drunk she gets, the stronger she becomes, and she carries a gourd treasured by the oni, which never empties of sake.
Touhou - Scarlet Weather Rhapsody
As with Immaterial and Missing Power, Scarlet Weather Rhapsody is a fighting game featuring a variety of Touhou Project characters. It appears to be similar in many ways to its predecessor, with many similar sprites and attacks. However, the inclusion of a new weather system that can affect the tides of battle, a 20 card deck system, and the implementation of flight marks a vast difference in gameplay between IaMP and its successor.
A bizarre phenomenon is occurring in Gensokyo. In the middle of summer, untimely rain and hail fall in the Forest of Magic, snow blankets Hakugyokurou, the Scarlet Devil Mansion is enveloped in a cloudy, dense haze, and the Hakurei Shrine is leveled by a sudden earthquake. Throughout the game, Reimu and the other protagonists set out to investigate the source of the strange occurrences.
Tenshi Hinanai is a celestial. Finding her newfound life in Heaven boring and monotonous, she enviously saw the youkai of Gensokyo stirring many incidents from above. Wielding the power to control the earth and the divine Sword of Hisou, the jaded celestial decides to instigate a catastrophe of her own.
Touhuo - Hisoutensoku
Touhou Hisoutensoku retains the same mechanics of spell cards, spirit orbs, and weather as Scarlet Weather Rhapsody, but also introduces new playable Touhou characters, spell cards, and weather-types. Many existing spell cards, weather-types and graphics from Scarlet Weather Rhapsody have been altered and in addition to the new characters, existing characters all have new spell card moves. Additionally, each playable character now has a system card (e.g. healing, weather change, bombs, etc.) associated with her that's usable by any character once unlocked.
A mysterious giant is seen wandering around Gensokyo. It can suddenly appear and can just as suddenly vanish seemingly without a trace. Everyone who sees it becomes curious and wonders about the truth behind this strange sight. Sanae Kochiya, Cirno, and Hong Meiling each have their own fears and dreams about the giant, and each sets out in pursuit of this roaming behemoth.
Exploring the Forest of Magic, the Scarlet Devil Mansion, and other locations in Gensokyo, the heroines face many challenges and obstacles in their pursuit of a mystery that's far deeper than it first appears.