Yami no Rumia (闇のルーミア, lit. “Rumia of the Darkness”) is a Touhou Project action platform fan game developed by “Otter's Arcadia” and it released at Comiket 81 on December 29, 2011, before its online release the next Rumia Day on January 7, 2012.

The game's title is a play on Hoshi no Kirby (星のカービィ, lit. “Kirby of the Stars”), the Japanese name of the Kirby franchise, so you can expect a Kirby parody with elements from Touhou Project. While it doesn't have an explicit story, some inference can be done on the game's opening sequence. Rumia was taking a nap, but wakes up, and see that a bunch of doors have appeared around Gensokyo.

• Patrol Tengu (哨戒天狗, Shōkai Tengu) - Momiji outfit. Slash enemies with a sword.
• Ice Fairy (氷精, Hyōsei) - Cirno outfit. Freeze surrounding enemies.
• Puppeteer (人形遣い, Ningyōtsukai) - Alice outfit. Throw exploding dolls. No, they don't kill you.
• Forgotten Umbrella (忘れ傘, Wasurekasa) - Kogasa outfit. Twirl an umbrella. Float in air.
• Crimson Watchguard (紅の自警隊, Kurenai no Jikei-tai) - Mokou outfit. Dash with a fireball.
• Tsurubeotoshi (つるべ落とし) - Kisume outfit. Turn into a bucket and drop like a stone.
• Newshound (ブン屋, Bunya) - Aya outfit. Tornado(?).
• Oarfish (竜宮の使い, Ryūgū no Tsukai) - Iku outfit. Shock surrounding enemies.
• Gatekeeper (門番, Monban) - Meiling outfit. (?)
• Elegant Maid (瀟洒なメイド, Shōshana Meido) - Sakuya outfit. Throws a knife. Can stop time once.
• Native God (土着神, Dochaku-shin) - Suwako outfit. Throws ring like a boomerang.
• Witch (魔法使い, Mahōtsukai) - Marisa outfit. Charged attack.
• Oni (鬼, Oni) - Suika outfit. (?)
• Wheelbarrow (猫車, Nekoguruma) - Rin outfit. Ride a wheelbarrow.
• Shrine Maiden (巫女, Miko) - Reimu outfit. (?)
• Mochi-Pounding Rabbit (餅つき兎, Mochi-tsuki Usagi) - Tewi outfit. Attacks enemies with a hammer.
• UFO - UFO outfit. Fly anywhere. Charged attack.
• Vampire (吸血鬼, Kyūketsuki) - Flandre outfit. Obliterates everything. Does not OHKO bosses.

You can find six “Darkness Shards” (闇の欠片, Yami no Kakera) throughout the game which will allow you to meet the true final boss and achieve the good ending. They can be found in obscure, monochrome rooms within Stages 1-4, 2-2, 3-2, 4-3, 5-5, and 6-6. A guide on how to collect these shards can be viewed here on Niconico Douga.

• The game is likely developed in WOLF RPG.

• The Legend of Twilight - Another game developed by “Otter's Arcadia”.

• Yami no Rumia
• Yami no Rumia on Niconico Encyclopedia