Female characters (minus the amazon) from a game called Inma Ka Sugoroku. Or Succubus Transformation Game. It's one of many games by a developer that made a lot of interesting corruption stories, where the goal is to slowly and secretly convert a village or town into succubi. This one however is just a board game. Each character has special abilities and a reason why they're participating.

Mira needs money to cure her sick mother, though she finds converting her into a fellow succubus a better solution. Irina is a confident mage adventurer that joined out of boredom. Theresa is a telepathic nun that got summons because organizer succubus wanted one. Tsugumi is a kunoichi that wants revenge for her country being destroyed.

As the title indicates, everyone starts human. They transform at certain levels of corruption. Male characters have four forms: Male, female, succubus, true succubus. Female have three, skipping the male phase. In succubus form, they still have their human mentality and sense of shame, but as true succubi, they just go full demon.

Use high weight, around 1.3.

Irina Human Form: IkS, Irina, IrinaH, green eyes, orange hair, long hair, medium breasts

Irina Succubus Form: IkS, Irina, IrinaS, green eyes, red hair, long hair, medium breasts, colored skin, demon girl, demon tail, demon horns, tattoo, pointy ears

Irina Human Clothes: white thighhighs, boots, blue dress, corset, blue caplet, IrinaC1

Irina Succubus Clothes: red panties, see-through, corset, boots, skirt, IrinaC2

Irina True Succubus Clothes: kiseru, boots, armlet, see-through, nipple piercing, IrinaC3

Mira Human Form: IkS, Mira, MiraH, blue eyes, brown hair, long hair, single braid, bangs, medium breasts

Mira Succubus Form: IkS, Mira, MiraS, purple eyes, brown hair, long hair, single braid, bangs, medium breasts, pointy ears, demon girl, demon tail, demon horns, demon wings

Mira True Succubus Form: IkS, Mira, MiraS, purple eyes, brown hair, very long hair, wavy hair, bangs, large breasts, pointy ears, demon girl, demon tail, demon horns, demon wings

Mira Human Clothes: long skirt, shirt, capelet, holding basket, green skirt, brown shoes, MiraC1

Mira Succubus Clothes: long skirt, green skirt, bare shoulders, off shoulder, long skirt, skirt slit, brown shoes, MiraC2

Mira True Succubus Clothes: jewelry, bare shoulders, blue dress, choker, detached sleeves, long dress, frilled dress, MiraC3

Therese Human Form: IkS, Therese, ThereseH, green eyes, orange hair, long hair, spiky long hair, medium breasts

Therese Succubus Form: IkS, Therese, ThereseS, green eyes, pink hair, long hair, spiky long hair, medium breasts, demon wings, demon horns, demon tail, colored skin, pointy ears

Therese Human Clothes: nun, habit, boots, cross, nun veil, ThereseC1

Therese Succubus Clothes: nun, habit, boots, ThereseC2

Therese True Succubus Clothes: nun, black habit, black veil, tight habit, long veil, metal collar, high heels, ThereseC3

Tsugumi Human Form: IkS, Tsugumi, TsugumiH, red eyes, black hair, blunt bangs, ponytail, medium breasts

Tsugumi Succubus Form: IkS, Tsugumi, TsugumiS, yellow eyes, blue hair, long hair, blunt bangs, colored skin, large breasts, demon horns, demon tail, pointy ears

Tsugumi Human/Succubus Clothes: ninja, kimono, gloves, fishnet, obi, sleeveless, ribbon, hair ribbon, boots, TsugumiC1

Tsugumi True Succubus Clothes: collar, spikes, bodysuit, high heels, boots, bracelet, nipples, leather straps, TsugumiC3