It has been announced that a new anime series related to the manga Osomatsu-kun will be produced by Studio Pierrot. This is to celebrate the 80th birthday of mangaka Fujio Akatsuka, who is known as the king of gag manga. The series will feature the Matsuno sextuplets and show how they have grown up over the years.

Created by Akatsuka, the manga began serialization in Shounen Sunday in 1962 before moving on to other magazines after 1969. Studio Zero produced an anime adaptation in 1966, which was later remade by Studio Pierrot into an 86-episode series in 1988. The manga won the Shogakukan Manga Award in 1964. Akatsuka ended the series in 1990 and died in 2008 from pneumonia.

Source: Moca News

Osomatsu-san on MAL


Update July 9
Cast and staff members were announced.

Cast
Choromatsu: Hiroshi Kamiya (Bakemonogatari)
Ichimatsu: Jun Fukuyama (Code Geass: Hangyaku no Lelouch)
Karamatsu: Yuuichi Nakamura (Gekkan Shoujo Nozaki-kun)
Osomatsu: Takahiro Sakurai (Diamond no Ace)

Staff
Art director: Seiki Tamura (K-On!)
Color Design: Yukiko Kakita (Akatsuki no Yona)
Editing: Kumiko Sakamoto
Music: Yukari Hashimoto (Toradora!)
Music Production: Avex Pictures
Sound director: Hiromi Kikuta (Haikyuu!!)
Sound production: Rakuonsha (Nichijou)

Source: Official site


Update July 10
Daisuke Ono (Kuroshitsuji) joins the cast and will play as the fifth son Juushimatsu.

Source: Official site


Update July 11
Miyu Irino (Tsubasa Chronicle) joins the cast and will play as the sixth and final son Todomatsu.

Source: Official Tweet


Update July 12
Aya Endou (Shirokuma Cafe) joins the cast and will play as Totoko, a girl with a firmed personality and all 6 brothers adore.

Source: Official Tweet


Update July 26
Two more cast members were announced.

Iyami: Kenichi Suzumura (Danshi Koukousei no Nichijou)
Chibita: Sachi Kokuryuu (Sengoku Otome: Momoiro Paradox)

Source: Tweet 1, 2