Your usage data can go to third parties for advertising, with no advance noticeSERIOUS
DATA SHARING
mediba can decide on its own to take the information you gave it and your usage history, remove what identifies you, and then either use it or pass it to third parties — including for ad targeting and search results. You are not notified beforehand. The clause says an opt-out page follows, but no link is actually printed in the terms, so the escape route is hard to find. "Cannot identify you individually" is also a judgment the company makes itself.
“当社は、お客さまへ事前に通知することなく、当社の判断により、お客さまが当社に開示した情報や利用状況等を、お客さま個人を特定できない形にした上で、今後の本サービスの改善・展開のため、本サービスに係る広告配信のため、検索結果の表示のため、又はコンテンツの提供等のために当社が利用すること又は第三者に提供することができるものとします。”
What you can do — Look for mediba's external-transmission opt-out page (linked from https://www.mediba.jp/privacy/policy) and complete the opt-out; if you cannot find it, ask mediba through the contact form on that privacy policy page.
Anything you type into the AI may be used to train itMATERIAL
CONTENT LICENSE
The terms say your input to the AI features may become training data for generative AI, and that using them is at your own risk. There is no opt-out offered — the only way to keep something out is not to type it. Note the odd pairing: the same document bans you from entering personal information into the AI, so the risk falls on you either way.
“お客さまは、お客さまが入力した情報が生成AIの学習データとして利用される可能性があることを理解の上で、自己の責任において本サービス上のAI機能を利用するものとします。”
What you can do — Do not type personal details, account numbers, health information, or anything confidential into the portal's AI features.
Payouts limited to direct, ordinary damagesMATERIAL
LIABILITY LIMITS
Even when the harm is mediba's fault, it will only cover damages that are direct, actually incurred, and "ordinary." Knock-on losses — lost income, wasted time, a bad decision made from wrong information — are excluded. The cap lifts only if the company acted on purpose or was grossly careless, which is hard for a consumer to prove.
“本サービスの利用に起因又は関連してお客さまが被った損害のうち、直接かつ現実に生じた通常の損害の範囲に限り損害賠償責任を負うものとします。”
No warranty at all on content, including AI answersMATERIAL
LIABILITY LIMITS
mediba promises nothing about whether articles, images, fortunes, weather, or AI-generated answers are accurate, complete, or useful, and it takes no responsibility for ads or outside websites you reach through links. If you act on something wrong you read there, you carry the loss. The AI clauses reinforce this: the answers may be false, are not personal advice, and you are told to check with a doctor, lawyer, or other professional for regulated topics.
“当社は、本サービスにおいて掲載する情報等のコンテンツ（記事、画像、占い、天気などを含みますが、これらに限られません。以下総称して「本コンテンツ」といい、以下同じとします。）について、いかなる保証（情報等の内容の正確性、完全性、有用性を含みますが、これらに限られず、以下同じとします。）も行いません。”
What you can do — Check anything important — especially health, money, legal, job, or travel information — against a professional or an official source before acting.
Access can be cut off on suspicion alone, under an open-ended rule listMATERIAL
TERMINATION
If mediba finds — or merely suspects — that you did something on its banned list, it can pause your use or end it permanently. The list closes with two catch-alls: using the service in a way the company did not anticipate, and anything else the company judges inappropriate. There is no appeal process, warning, or review step described. Separately, the service itself can be paused without notice or shut down entirely.
“以下の行為が判明し、又は疑われる場合、お客さまの本サービスのご利用の一部又は全部を一時的に停止又は中断し、若しくは将来にわたって終了することがあります。”
Terms can be rewritten without asking youMATERIAL
UNILATERAL CHANGES
mediba can change these terms on its own using Japan's standard-form contract rule. It only has to post the change, the new wording, and the effective date on the service or announce it "by another reasonable method." You will not be asked to agree, so a change can take effect while you never see it. Separate service rules and guidelines also count as part of the contract, and if they clash with the main terms, those separate rules win.
“当社は、前項の規定による本規約の変更をするときは、本規約を変更する旨及び変更後の本規約の内容並びにその効力発生時期を、本サービス上に掲示する方法その他相当の方法で周知します。”
What you can do — Check the terms page on the au Web portal now and then, since changes may only be posted there.
Google Analytics collects device informationMINOR
DATA COLLECTION
The portal uses Google Analytics, which picks up encrypted device system logs and device-specific identifiers to track how you use it. Google — not mediba — controls that data afterward, and any complaint or request to see it must go to Google. The upside: you can switch it off yourself.
“Googleアナリティクスは、暗号化された端末のシステムログ情報・端末固有の情報等（以下「起動情報等」といいます。）を取得します。”
What you can do — Install Google's Analytics opt-out browser add-on or use Google's opt-out page to stop this collection.
Strictly personal use, and you carry the risk for outside linksMINOR
USER OBLIGATIONS
You may use the portal only for yourself — any business or other non-personal use, and any reuse of the material, is banned. You also cannot transfer your rights under these terms to anyone. Complaints about content from KDDI or other outside providers must go to that provider directly; mediba says it will not pass your message along. Ads and linked outside sites are entirely your own risk.
“お客さまは、本サービスをお客さま個人の利用のためのみに利用するものとし、業務目的や、その他個人利用以外の目的での利用及び二次利用を一切してはならないものとします。”
Lawsuits must be filed in TokyoMINOR
JURISDICTION
If a dispute turns into a lawsuit, the Tokyo District Court is the only court that can hear it first, under Japanese law. For a user living far from Tokyo, travel and cost make suing much less practical. Japanese consumer law can sometimes override this kind of clause, but as written it points everyone to one court.
“万が一、紛争になった場合には東京地方裁判所を第一審の専属的合意管轄裁判所とし、日本法に準拠して解決するものとします。”