when does kohaku confess on the boat in the anime

Kohaku does not have a confirmed “confession on the boat” scene in the anime. The moment people usually point to is more of a teasing or emotionally loaded exchange in Dr. Stone , not an explicit confession.

What fans mean

• In fan discussion, Kohaku is often described as having romantic feelings for Senku, but the anime never clearly turns that into a direct confession.

• The “boat” wording is likely from ship discussion around their relationship development rather than a canon, spoken confession scene.

Most likely interpretation

If you meant Dr. Stone , the scene is probably being mixed up with a later relationship moment or fan interpretation of Kohaku’s feelings, not a formal confession episode.

TL;DR

There isn’t an anime episode where Kohaku plainly confesses on a boat. It’s better described as a fandom-read romantic moment, not an official confession.