The first official match was played on November 17, 1965 when KooKoo won the Kuusankoski Puhti goals 4–2.

A new club for ice hockey skills got plenty from Lappeenranta, where many of its first-year players and coaches came from.

KooKoo started its career in the official series of the Association in the 1966–1967 season, when it participated in the Southern Finland division of Maakuntasarja.

In the 1969–1970 season, KooKoo ranked second in the Kymenlaakso division and reached the Suomensarja qualifier but wasn't promoted.

In the spring of 1988, KooKoo played a very tight five-game relegation series with Lahden Kiekkoreipas.

The team's last season in the league was very weak and it was relegated back to the first division after losing to the qualifying round for Hockey Reipas.

It succeeded in winning the Uudenkaupungin Jää-Kotkat in the matches 3-2 and was promoted to the first division after the two-year absence.

KooKoo made the 2019–2020 season Kouvola's hockey history for the first time making to the league playoffs.

At the 2021–2022 season, KooKoo advanced for the third time to the playoffs, in Wild-card round ended up against a familiar local opponent Lahti Pelicans.