The anime series Osomatsu-san begins its fourth season on July 8. Alongside this, a new key visual, a preview, and details about the ending theme song have been released.

The official key visual, designed by character designer and animation director Yasuhiko Eiji, shows the six protagonists in a summery atmosphere. Fantastic elements complement the scenery.

The new preview presents the brothers in typically eccentric situations, accompanied by the new opening song "Osomatsu-san no Bombashe!" by the group DA PUMP.

The ending theme is the song "Buddy," performed by Hitomi (Ataarayo) together with the six brothers. The track was produced by Katsuya Kamada. The composer describes it as a tribute to the creator of the series, Fujio Akatsuka, whose work celebrates diversity and solidarity. Singer Hitomi emphasized the creative collaboration during its production.

The series is based on Akatsuka's classic work Osomatsu-kun and portrays the lives of the adult brothers with their unconventional lifestyle. After three successful seasons (2015, 2017, 2020) and several theatrical films, the anime adaptation celebrates its 10th anniversary this year.