Chihiro’s Casual Blog is a Japanese information website created to help people identify unfamiliar calls and respond safely to unwanted sales calls, nuisance calls, and suspected scams. Run by Chihiro, a freelance site administrator in her 50s, the site grew from her own experience dealing with troublesome calls. It publishes information on more than 20,000 phone numbers, drawing on collected reports and reviews, and adds or updates entries daily.

Visitors can search by number, browse by number range or caller category, and read details about reported callers and suggested responses. The site also provides practical guidance on recognizing scam tactics, handling promotional calls, blocking unwanted numbers, and finding relevant reporting options. Its resources include articles and comparisons of call-blocking devices, smartphone apps, and other countermeasures, as well as guides on topics such as investment solicitations and caller ID settings.

Chihiro’s Casual Blog presents itself as an independent resource, not affiliated with the companies or institutions mentioned, and aims to help readers make informed decisions when an unexpected call arrives