Launch of AI-Powered Inheritance & Estate Appraisal Service: AI Identifies Items and Flags Non-Sellable Goods to Unlock Dormant Household Assets

Service website: 'Room-Wide AI Appraisal satei-ai' (satei-ai.com)

Renue Inc. (Headquarters: Minato-ku, Tokyo; Representative: Yusuke Yamamoto) has added a new mode specialized in inheritance and estate sorting to its AI appraisal service 'Room-Wide AI Appraisal satei-ai' (https://satei-ai.com/), which uses AI to detect furniture, electronics, branded goods, and other items from room photos and provides estimated resale values.

Amid Japan’s aging population, more families are facing the task of cleaning out parents’ homes and sorting through inherited belongings. In 2024, petitions for renunciation of inheritance at family courts exceeded 300,000 for the first time, reaching a record high of 308,753 cases (Supreme Court). Families must make rapid decisions under time pressure: what to keep, what to sell, and what to discard.

The new mode uses object detection AI and generative AI to identify items that must not be discarded—such as cash, bankbooks, stock certificates, or memorial photos—and clues to potential debts. It temporarily suspends selling or disposal until the decision on inheritance renunciation is finalized. From valuation to handover to experts, the service provides families with the information needed to make regret-free decisions.

Executive Summary

- In 2024, Japan recorded 1,605,378 deaths, the highest on record (Ministry of Health, Labour and Welfare), and inheritance renunciation filings reached 308,753, surpassing 300,000 for the first time (Supreme Court). Estate sorting has become a series of unavoidable decisions for nearly everyone.

- Selling or disposing of inherited property may constitute 'legal simple acceptance' under Article 921 of the Civil Code, potentially invalidating the right to renounce inheritance. If inheritance cannot be renounced, heirs may be liable for debts discovered later. The petition deadline is three months from the time the heir becomes aware of the inheritance. satei-ai introduces 'pre-disposal verification,' pausing all selling and disposal pathways until the status of inheritance renunciation or limited acceptance is confirmed. During this period, no total resale estimate is displayed.

- The service alerts users to irreplaceable items like cash, bankbooks, certificates, and memorial photos. It detects important documents and potential debt indicators visible in photos, maintains a tamper-proof inheritance asset ledger recording item locations and disposal plans, and generates estimation request materials and checklists for estate clearing companies—all organized through photo uploads and AI consultation.

- satei-ai is a neutral appraisal service that does not act as a buyer or seller. It avoids definitive pricing, does not authenticate authenticity, and never pressures users to sell, maintaining a design focused on user autonomy.

Background: Estate Sorting as a Universal Life Event

Japan’s 2024 death toll of 1,605,378 set a new record (source: Ministry of Health, Labour and Welfare, '2024 Population Dynamics Statistics (Final)'). Clearing out parents’ homes is no longer an exceptional event but a common life stage. Nationwide, vacant homes have reached 9.002 million units, with a vacancy rate of 13.8%—both record highs (source: Ministry of Internal Affairs and Communications, '2023 Housing and Land Survey')—and more families are confronting 'emptying the family home.'

At the same time, inheritance renunciation filings at family courts exceeded 300,000 for the first time in 2024, reaching 308,753 cases (source: Supreme Court, '2024 Judicial Statistics Annual Report, Family Division'). Renouncing inheritance is a legal process to avoid assuming the deceased’s debts. However, disposing of inherited assets carelessly may be deemed 'legal simple acceptance' under Article 921 of the Civil Code, forfeiting the right to renounce. If renunciation is not possible, heirs must generally assume any discovered loans or guarantee obligations. The filing deadline is 'within three months of becoming aware of the inheritance' (Civil Code Article 915). Grieving families are forced to make rapid decisions about what to keep and what an item is worth.

Meanwhile, the estimated value of unused household items lying dormant for over a year—'hidden assets'—is approximately ¥90.5352 trillion nationwide, averaging ¥715,000 per person, with those in their 60s averaging over ¥1 million (source: Mercari Inc., '2025 Survey on Hidden Assets in Japanese Households,' supervised by NLI Research Institute). Multiple private surveys consistently rank 'not knowing what can be discarded' and 'uncertainty about disposal' as top challenges among those who have experienced estate sorting.

The triple dilemma—'Can I discard this?' 'Can I sell this?' 'Is this even an appropriate time to sell?'—must be faced without adequate knowledge. This is the core social challenge in estate sorting. This update is satei-ai’s response as an AI service to the problem of being forced to decide without understanding.

About 'Room-Wide AI Appraisal satei-ai'

satei-ai is a service that uses object detection AI to identify furniture, electronics, antiques, kimonos, books, and other items from smartphone photos of a room. Generative AI then organizes estimated resale values, authenticity verification tips for potential counterfeits, and pre-sale checklists—all on a single screen. Users can comprehensively assess room contents without the tedious process of photographing and listing items one by one.

Sample screen showing AI detecting 28 items including furniture, electronics, antiques, and kimonos (actual satei-ai interface)

satei-ai does not act as a buyer or seller. It is a neutral appraisal service designed to help users research 'how much this might sell for.' Prices are presented only as estimates with supporting rationale, and authenticity is not definitively judged but highlighted with verification tips. The final decision to sell or dispose rests entirely with the user.

This Update: Inheritance & Estate Sorting Mode

1. 'Pause Before Selling'—Pre-Disposal Verification (Inheritance Renunciation Risk Gate)

When handling a deceased person’s belongings, the service checks the user’s status regarding inheritance renunciation or limited acceptance (unconfirmed, under consideration, not considering). Until the status is clarified, selling and disposal are placed on 'hold.' During the hold period, no total resale estimate is displayed. Individual item prices switch to 'reference price ranges,' and listing links to flea market apps or 'sell candidate'/'dispose candidate' buttons in the ledger are temporarily disabled.

Screen showing 'Inheritance & Estate Sorting' selected, inheritance renunciation status unconfirmed, triggering 'pre-disposal verification' and AI placing disposal on hold

satei-ai does not determine whether renunciation is possible. Instead, it prompts users to consult professionals such as judicial scriveners, tax accountants, or lawyers, embedding the principle of 'pause before deciding' into the product’s behavior. While appraisal AI systems are structurally incentivized to encourage sales, satei-ai, by not being a transaction party, can implement a feature that stops sales.

Once the status is confirmed, the hold is lifted, and the total resale estimate and listing pathways are displayed. The design is not 'prevent selling' but 'sell only at the very end, after confirmation.'

2. Four Modes That Adapt to Context

If the input text includes keywords like 'inherited items,' 'inheritance,' or 'clearing the family home,' the AI detects the context from the conversation and automatically switches the appraisal results to an estate-sorting format. Users can also manually select from four modes via the 'First, choose your situation' panel: standard appraisal, inheritance & estate sorting, pre-estate planning, or family acting on behalf.

In 'family acting on behalf' mode, the system records whether consent from the individual has been obtained and the status of legal authority (guardianship, power of attorney, etc.). Until confirmation is complete,