Hana Mori is known as the Finder of Lost Things. She did not plan to become famous. She only wanted to find her blue umbrella.

When Hana was ten, she lost the same umbrella six times in one month. Her family said she should be more careful. Hana agreed, but she also thought umbrellas should be more cooperative.

At sixteen, she built her first Lost-Item Compass. It did not point north. It pointed toward the thing she had forgotten. The first test was successful: the compass found her lunch box under the piano.

Hana later opened a small workshop near the station. Students brought missing gloves, office workers brought missing keys, and one teacher brought a missing sense of humor. Hana found the gloves and keys. The humor took longer.

Her most popular invention is the Gentle Reminder Bell. It rings softly when someone leaves a bag behind. If the person ignores it, the bell sighs.

Today, Hana still loses her own umbrella sometimes. She says this is important research.