Neko Kawaigari

Neko Kawaigari is an H-game by 13cm, about a private clinic of catgirls.

The Player Character is Jack, a dog-man with no memory of how he got there, only that he was rescued by the head of the clinic, Dr. Alice Crane.

In order to repay her, he becomes an odd-job man at the clinic, helping with the patients, whom are the aforementioned catgirls. Considering they are, in fact, the patients, they all have some sort of illness.

Primarily known for the mild Memetic Mutation the (NSFW) opening is subject to, due to the Gratuitous English and awkward lyrics.

Was being fan-translated by Tengu Translations, but due to a C&D notice, was dropped.

Neko Kawaigari provides examples of:

 * Alternate Reality: As with most kemonomimi series.
 * Bait and Switch Credits: The opening gives the player almost no clue to the actual storyline at all.
 * Big Eater: Norma.
 * Catgirl: No, duh.
 * Cerebus Syndrome
 * Cloudcuckoolander: Norma.
 * Does Not Like Men: As her Tsundere manner shows, Faye.
 * The ending. As noted in the ending song, ALL of the Catgirls died.
 * Eroge
 * Fiery Redhead: Faye, when she's not in one of her sadder moods.
 * Genki Girls: Umi and Nami.
 * Idiot Hair: Umi and Nami.
 * Lolicon
 * Meganekko: Norma, although only in her pajamas.
 * Odd because the OP specifically describes her as "spectacled," and yet she very rarely appears so.
 * Mood Whiplash: Dr. Crane going on about the girls' diseases is sometimes ruined by Norma being...Norma.
 * Not to mention right after the Rape As Drama H-scene, where we get a Super-Deformed CG of Modesty Bedsheet-clad Faye administering a Megaton Punch to a nosebleeding Jack.
 * Multiple Endings: "Romantic" endings with each of the girls, and an unlockable rather depressing true ending.
 * Nightmare Sequence: In a scene called "The Shining", Dr. Crane has one about being chased by an Ax Crazy murderer.
 * Overly Long Name: The whole title is "Neko Kawaigari! ~Klein Inuneko Byouin Shinsatsuchuu~"
 * Pettanko: Dr. Crane, Umi and Nami.
 * Petting Zoo People: Including the protagonist himself, oddly enough.
 * Rape As Drama: A scene in Faye's chapter.
 * Shout-Out: To The Shining, see Nightmare Sequence above.
 * Single-Minded Twins: Umi and Nami sometimes skirt the line of this.
 * Spell My Name With an "S": The doctor's last name is clearly stated in English (on the CG Gallery menu) to be "Crane", but so far all transliterations of the game's full title spell it "Klein".
 * Spit Trail Kiss: Umi and Nami share one in an H-scene.
 * Token Mini-Moe: Umi and Nami. Maybe Dr. Crane, too.
 * Twin Threesome Fantasy: Just another facet of Umi and Nami's charm.
 * Tsundere: Faye.
 * Interesting in that her exaggerated tsundere nature is actually part of her diagnosis; she's bipolar.
 * Dr. Crane has shades of this too.
 * Utsuge
 * Vague Age: Dr. Crane. Loli, or just...underdeveloped?
 * Verbal Tic: As a part of their Single-Minded Twins gimmick, Umi often chimes in with "Umi too!" after Nami states her mood/opinion/what have you.
 * Visual Novel
 * Wise Beyond Their Years: Even before Jack gives them the 'treatment', Umi and Nami have a special "game" of their own for when they get worked up...
 * You Gotta Have Blue Hair: Norma is blue, Umi and Nami are pink, and Faye is bright red. (See: Fiery Redhead)