Succubus in Wonderland

Succubus in Wonderland (不思議の国のサキュバス Fushiginokuni no sakyubasu) is an eroge released by developer 62studio on April 21, 2020. It follows Reto, a human boy who falls down a well and ends up in a strange world full of succubi.

The game is available on DLsite here. A machine translation patch of the game is available here.

Story
Reto is the son of two animal researchers who are well-respected by their village. His parents leave one morning to study animals. Afterwards, Reto spots a talking white rabbit who complains about being late and runs off. He leaves the village and encounters the rabbit again, who leads him towards a well. Reto examines the well and falls in.

Reto ends up in front of a mysterious castle. A succubus gatekeeper approaches and tries to seduce him, only for another succubus, Lewis (daughter of the Queen of Hearts, the ruler of the succubi), to come to Reto's aid. After they defeat the succubus together, Lewis says she'll help Reto return to his world. The two of them set off from the castle. Meanwhile, a masked blue-haired succubus watches from the castle gate.

Later, while going through Stray Coast, Lewis asks Reto about how he came here, and says that the rabbit he met might be March Hare. They then meet the enigmatic Cheshire Cat, who tells them about Hearts Day: a day when the Queen will drain many other succubi to death in order to increase her own power, though this was formerly a simple holiday that was celebrated by releasing balloons.

Throughout their journey, Reto and Lewis occasionally encounter other strange individuals: Alice, another human who ended up in this world; a talking bird named Lorina; and the Hatter, a profit-minded succubus who runs numerous shops around the world.

Eventually, the pair arrive at Atuchu Cave, in which three succubus attack Lewis and Reto falls through a pitfall. Reto encounters the masked succubus, who introduces herself as Lewis' sister Carroll and says the other succubi are currently training Lewis. She attacks him, but gives Reto a handicap to allow him to "win". She warns Reto that Lewis is merely using him and then leaves. Reto runs back to Lewis and the three succubi leave, but not before they've drained a lot of Lewis' power. Reto has to bring Lewis back to a previous village for treatment, after which they continue their journey.

Reto and Lewis eventually meet the March Hare, but it turns out that she wasn't the one who brought Reto to Wonderland. As they leave the Hare's house, the Hatter (here for a tea party) asks Lewis what she plans on doing about Hearts Day. Lewis says she can't fight her mother and this is why she accompanies Reto, then tries to cover up her slip of the tongue. They leave the house.

In Zendegee Forest, they meet Carroll again. Carroll reveals that Lewis is simply raising up Reto to feed on his power, and is lying about helping him return home. Lewis admits this was her original plan but she now only wants to help him. Carroll attacks but is defeated by the combined efforts of Reto and Lewis. The succubus sisters get into an argument over what to do regarding their mother, and Carroll storms off. Shortly afterwards, the pair encounter Cheshire Cat again, who claims she's betting on whether the two sisters or the Queen of Hearts win.

While passing through Papilio Plain, they meet Cheshire Cat again. She attacks and, after being defeated, thanks them for the entertainment. She says that the curse on the Queen of Hearts can be broken by stirring up her emotions, but this must be done soon before the Queen's magic increases on Hearts Day.

Later, in Proof Undersea Tunnel, Lewis is kidnapped by slimes. Shortly after, Reto is surrounded by slimes but is saved by Carroll. Carroll admits that she changed her mind after hearing Lewis' words in their last encounter. They defeat the Slime Queen (who was responsible for the slimes' organized attacks) and rescue Lewis. Carroll says she now wants to work with Lewis to break their mother's curse, and reveals that she's also run away from home.

Finally, the trio return to the castle and confront the Queen of Hearts. The Queen offers to reduce Carroll's punishment if she betrays the other two. Carroll pretends to accept this offer, but instead hits the Queen with a spell that harms only the evil. Enraged, the Queen summons her soldiers, but the Hatter and Cheshire Cat appear, the former using a treasure to paralyze all the soldiers. The Queen suddenly groans and, with her original personality, warns her daughters to run. She teleports them all away. The Hatter notes how the curse was briefly broken by the Queen feeling strong emotions. The trio confront her again and begin fighting. The Queen has incredible power that makes her seemingly invincible, but Carroll and Lewis appeal to her original self, causing her power to gradually fade. She tries to convince Reto to leave as the succubus sisters will inevitably betray and kill him, offering to spare only him if he agrees, but Reto refuses. Finally, the Queen is defeated and Carroll uses her spell again, breaking the curse.

Back to her original personality, the Queen thanks them and says she'll make amends for everything she's done. Lewis asks the Queen to help Reto return to his world, and the Queen gives him a key that, when used with a magical monument on the castle roof, will open a one-way path back home. The three succubi say goodbye to him, though add flirtatiously that he can always come back to them. Reto uses the key and disappears. The Queen then tells her daughters to prepare balloons as they'll make this a Hearts Day that everyone will remember.

The credits roll, showing the succubi celebrating Hearts Day by releasing balloons. Among other scenes, Alice and Lorina look at the scenery from a hill, and the Cheshire Cat tells you (the player) that there's more interesting things to come.

Back in the human world, Reto finds that the well has become a simple hole in the ground. His parents approach and, from their reactions, it seems that little time has passed. They go home. Then next day, Reto visits the site of the former well and encounters the White Rabbit, the same rabbit he'd encountered at the very beginning. The White Rabbit says it plans to curse the queen again, that it was responsible for destroying the well, tells Reto to forget about the succubi, and disappears. Afterwards, Reto can go to a well in his village and return to Wonderland from this.

In darkness, a mysterious voice addresses Alice and talks about destroying everything.

Reto reappears next to a suprised Lewis. He explains what just happened and Lewis deduces that the White Rabbit will return to the castle to curse the Queen again. She says Reto doesn't need to risk himself any more, but Reto insists on helping. They hurry back to the castle and confront the White Rabbit in a room. The White Rabbit talks cryptically about the sins against Alice and this story soon coming to an end, then attacks. When defeated, she tells them to enjoy this peace while it lasts, but she'll finish it in the future. She suddenly changes to a different personality, one unaware of the situation. Carroll arrives and explains that the White Rabbit was herself a pawn of someone from a different world, though that someone won't be able to act again for some time as they'll need time to recover their power. The succubus sisters decide to continue investigating this matter.

Once again, there's a mysterious voice in darkness, who mentions Alice and Lorina's names, and talks about revenge and ending the story.

Guides

 * Walkthrough: http://think-game.com/archives/40506826.html
 * Information on enemy stats, recruitment, cooking recipes, medals etc.: http://think-game.com/archives/40499106.html