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Koimo
Start chatting

Someone’s waiting for your reply.

Chat and roleplay with AI characters. Flirt, scheme, solve a murder, or just talk until 3 a.m. Pick someone below or create your own.

Characters

Koimo originals

アカネAkane at a vintage microphone beside the piano in the Blue Hour jazz club after midnight.

They play the scene with you.

Answer in your own words, or pick a line. They react, stay in character, and keep the story moving.

AkaneアカネThe second set

She finds you in the crowd and doesn’t look away.

Akane: Second set’s for you. Don’t make me regret it.

Keep the ones you’d hate to lose.

Coming from Character.AI? Back up your characters and chats for free, keep the files in open formats, and keep talking to them here.

  1. 1Save them with CAI ToolsThe free browser extension, on a computer, exports your characters and chats.
  2. 2Drop the files into KoimoThey’re read on your device. Nothing is uploaded until you choose to save them.
  3. 3Pick up where you left offYour chat history comes with them, so the story keeps going.
Bring your characters Read the backup guide

On a phone? Request your official export from Character.AI now; it can take weeks to arrive. The guide covers both routes. Koimo also reads Character Card V2 and V3 files and SillyTavern chats.

koimo-backup.zipExample

  • koimo-backup/
  • index.htmlRead everything in a browser
  • characters/
  • Rin/
  • Rin.pngCard for SillyTavern, RisuAI, Chub
  • Rin.card-v2.jsonCharacter Card V2
  • Rin.card-v3.jsonCharacter Card V3
  • chats/
  • After hours.jsonlSillyTavern chat
  • After hours.mdPlain text
  • Aya/
  • Soren/
  • README.txtWhat each file is for

Read it as a scene. Or keep it in your messages.

Switch views whenever you like. Same character, same story, same memory.

Rin holds the rooftop door open above a quiet city at dusk, glancing back at you.
Rin リンAfter hoursAI character
  1. You

    leans on the railing beside him You come up here every night?

  2. Rin

    He doesn’t look away from the city.

    Only the ones worth staying up for.

  3. You

    And tonight?

  4. Rin

    He finally glances at you, and the smile gives him away.

    Ask me again in an hour.

They remember.

Characters keep notes as your story goes: the promise you made, the name you gave the cat, the thing you admitted at 2 a.m. Read what they keep, pin what matters, and fix anything they got wrong.

Three weeks later

Soren ソレン

He doesn’t look up from the ledger, but he’s smiling.

Ledger missed you. So did I. Don’t tell him.

What Soren remembers

  • Sep 29You named the archive cat Ledger.Used in his last reply
  • Oct 3You hate goodbyes. Never end on one.
  • Oct 11You promised to come back for the missing volume.

Story so farYou found the archive by accident and kept coming back. Soren still won’t say what’s behind the locked door.

Nao sits beside a rain-streaked café window with a photograph and two untouched coffees on the table.

Nao ナオ

She doesn’t look up from her coffee.

Nao: You’re late. I was starting to enjoy the peace.

Write someone new.

Give them a voice, a past and a few loose ends. Start with a handful of fields, open every card field when you want them, and test-chat while you write.

Name
Nao ナオ
Voice

Pick one and watch her line change.

Past
Left the force. Won’t say why.
Loose end
Orders two coffees. Drinks neither.
Create a character Import a card

Yours, in plain words.

Take everything with you
Export any character as a Card V2 or V3 PNG or JSON, and any chat as JSONL, Markdown or HTML, whenever you like.
Private by default
Your chats are never used for training. Delete your account and everything in it in one step.
Who processes your chats
Replies are written by DeepSeek’s models. Most chats are processed in China; chats from the EU, UK and Switzerland go to a host in the EU or US. Privacy policy
Free to start
50 messages a day on the free plan. The import and export tools are free, always.
For adults
Koimo is 18+. Romance, drama and dark themes are welcome; explicit scenes fade to black. Content policy

A character.
A first line.
Your next story.

AI character chat for romance, fantasy, mystery and the conversations that run past midnight.

What is Koimo?

Koimo is an AI character chat and roleplay site for adults. Meet an original character, create your own or bring a supported character card. Write your part of the scene and let the character reply.

Can I use it for free?

The free chat allowance is 50 messages a day. The local backup and conversion tool is free without an account.

What can I roleplay?

Try slow-burn romance, anime-inspired city stories, fantasy, sci-fi, mystery or cozy chat. Koimo is 18+; explicit scenes fade to black. Find your kind of roleplay.

Can I bring characters from C.AI?

Supported CAI Tools files and character cards can be previewed and converted. Keep both the card and the conversation file. Official account-export parsing is not supported yet. Read the backup guide.

A rain-wet crosswalk after midnight: red signals, empty road, one convenience store still lit.

???

Same place tomorrow?

Start chatting Bring your characters