Mattsu to Yanma to Moburi-san 2: Suigun Otakara to Nazotoki no Shimajima
English title: Mattsu, Yamma and Moburi - The Naval Treasure and Riddle Island
Japanese title: マッツとヤンマとモブリさん2 ―水軍お宝と謎解きの島々―
Type: ONA
Source: Original
Episodes: 1
Status: Finished Airing
Aired: Oct 23, 2014
Duration: 13 min
Rating: G - All Ages
Genres: Fantasy

The sequel will focus on the islands west of the city. 

(Source: ANN)