An article with info on the then-upcoming game.
Contra Spirits 64 is a canceled entry in the Contra series that was being in development in 1998 by Konami Computer Entertainment Osaka and was planned to be released on the Nintendo 64.
The game was presumably going to be a side-scrolling platformer shoot 'em up in 2.5D, with the camera probably changing to a higher perspective in certain sections and boss battles.
Most likely due to poor sales of the Nintendo 64 in Japan, Konami ultimately decided to stop the project and disbanded the team, which then were assigned to work separately in different projects.