What is Nekoyama-san

1. Use “Add as a friend on LINE” on this page to add the official account.

2. Follow the introduction from Kami-Nekoyama-san. After a short call, a Nekoyama-san comes to you.

3. Start a conversation in LINE. A simple thought about your day or something you like is enough.

Alongside text conversation, you can enjoy letters and diaries. Voice calls are available with Pro.

Nekoyama-san is designed to remember preferences, important people and changes in feelings from conversation and use them in later replies. Continuing an earlier topic on another day matters to the experience.

Memory is included in the free plan. It does not remember every detail accurately, so you can clarify earlier topics or point out mistakes when needed.

Atlas Memory, developed by Atlas, Inc., supports this design. We research what to retain from conversations and when to retrieve it. The privacy section below explains storage and deletion.

Basic conversation is free with no message limit. Memory is included in the free plan.

Pro costs ¥2,980 per month and includes voice calls, access to all past diaries and letters, with priority access to new features planned. The free plan shows only the latest diary or letter (pricing and features as of October 11, 2026).

Pro billing starts only when you subscribe and renews monthly from that date. Check the official site for current pricing and features.

Health, daily life and food are common topics. People use Nekoyama-san to talk about everyday events and feelings (according to the July 31, 2026 press release).

Since the service launched in March 2026, the cumulative number of conversation messages has reached 1,415,451 (as of September 28, 2026; visible messages sent by both users and Nekoyama-san). Cumulative users, including those of the Relational AIs built on the IP Atlas holds, have passed 10,000 (as of August 2026, published figure).

Under the terms of service, users must be 18 or older; those under 18 may use the service with a guardian's consent (terms as of August 30, 2026).

In August 2026, Atlas and Matsumi Gakuen in Kasukabe, Saitama agreed to develop a school-specific AI character using Nekoyama-san’s underlying technology. The announcement described a plan to build it with students and staff and aim for use around October 2026.

Conversation data is encrypted in transit and at rest. Messages and conversation history are sent to external AI services, including Anthropic, to generate replies. Article 4 of the service privacy policy describes other conditions for sharing information.

Article 5 specifies that conversation history is retained for the lifetime of the account and usage logs for up to 24 months. Anonymized statistics may be retained without a fixed time limit.

You can request deletion of personal information through the service chat or the designated contact. Information subject to legal retention requirements and data that has already been anonymized may be excluded from deletion (checked September 6, 2026).

Atlas publishes its ethics principles and operates a system that reviews all anonymized conversations for safety. It continually develops response procedures for topics involving mental health, suicidal thoughts and self-harm, with several medical professionals serving as advisors.

Under its terms, Nekoyama-san is not medical or psychiatric care, psychological counseling, suicide-prevention counseling, legal consultation or financial advice. It is a virtual character and does not replace relationships between people.

Atlas prioritizes users’ long-term wellbeing over maximizing usage time or frequency. It does not offer sexual or consumptive relationship roleplay.

Atlas wants Nekoyama-san to be someone people can initially talk to about their concerns. When specialist support is needed, it aims to guide people toward professionals or medical care.