What is the relationship between Heiye Haidong and Xiaolan? What's the story in that episode?

It doesn't matter. You seem to be mistaken.

076 Conan vs Blackfield Haidong (1 hour special) is the true Kuroha of KID and his childhood friend Nakamori Aoko crossing the road in the rain, passing Xiaolan and Garden. Because Xiaolan looks like Kudou Shinichi, Xiaolan mistakenly thinks Xinyi has a girlfriend.

2 19 detective's party! Xinyi VS thief boy

This is a confrontation between Shinichi and imp's wisdom. Kidd's father and predecessor Kuroba Touichi were killed by a black organization, so Kidd has been looking for a gem to solve this mystery. He thinks that the first time he saw the jewelry on the clock tower in Qing Zi, he invited him to steal it. Classmate Koizumi Akako seems to be a fortune teller. She knows the identity of Kuaidou ... Qing Zi's father is a Zhongsen policeman, and he has been worried that he can't catch the child, so Qing Zi and. Just like Xiaolan Xinyi, Kuaidou likes each other psychologically, but it is not open ~ ~ ~ Hehe, and then there are cases collected by a detective. This episode is quite wonderful and should not be missed.