When did Conan neutron know the identity of Haidong Black Leaf?

Hiroko did divination, and the result of divination said that all men in the world fell at her feet, except Haidong Blackmarket.

The next day is Valentine's Day. Hiroko is at school. A group of boys are fascinated by her and compete for her chocolate.

I don't know about Valentine's Day. A group of girls gave him chocolate. He is very happy. He saw a group of boys asking Hiroko for chocolate and asked for it. Hiroko asked him to throw away all other people's chocolates. He didn't lose them, but he left happily with a lot of chocolates.

Hiroko is very angry. He thought of the divination results and naturally knew that he was Kidd.

Then something happened, which confirmed Hiroko.

In the comic book of magical fighting

The sixth sentence of the first volume "The temptation of blushing"