What's the relationship between Genzo and Koji in the manga?

I'm not sure exactly. It could be that they are related in some way within a specific story or context.

They have a competitive but respectful dynamic. Misugi and Genzo often challenge each other on the field.

They have a complex and evolving relationship. Sometimes they are allies, sometimes rivals.

Genzo and Taro's relationship could be anything from siblings with a deep bond to complete strangers who cross paths and have an impact on each other's lives in unexpected ways. It all depends on how the manga unfolds.

They have a complex friendship. Kojiro and Genzo support each other but also have their moments of conflict and misunderstanding.

It's a complex and evolving relationship. They start as rivals but gradually develop a mutual respect and maybe even a friendship.

They have a complex and evolving relationship. Sometimes they are friends, sometimes there's a hint of romance.

It's a complex relationship. They might be rivals or friends, depending on the context of the manga.

They have a complex relationship. Sometimes they are rivals, but at other times they work together.

I'm not really sure. Maybe they are just characters in a story with no direct connection.