Kenji made his first appearance in episode 2, where he was sent to go shopping for Ikuko. When he meets Usagi coming home from school, he asks about Luna when he sees she is following them home, to which Usagi replies that the cat is her friend.
In the beginning of episode 3, he is seen reading the newspaper about the "mysterious sleeping illness".
In episode 9, he falls under the effects of Jadeite's cursed clocks, and is shown running out the door, late for work, when Ami is talking to Ikuko.
In episode 22, Kenji attends the embassy reception for the Kingdom of D for his work. While at the reception, he sees a girl who looks like Usagi to him (who actually is Usagi) and hopes that his daughter will grow up to be as pretty as she is.
His last appearance in the first series is in episode 45, where Usagi makes curry for her father, mother, and older brother, but comes out with terrible results.
Sailor Moon R
Kenji's first appearance in the second series is in episode 50, where he and Shingo attend the new virtual theater.
His final appearance in the second series, as well as in the entire first anime series, is in episode 66, where Chibiusa becomes upset that Ikuko and Kenji will not be able to attend her class's party where they will be making curry.