MK2 Films has boarded “Roca,” the new feature from acclaimed Japanese filmmaker Koji Fukada , whose latest film, “Nagi Note,” premiered in competition at Cannes Wednesday. Adapted from a manga by Hisaichi Ishii (“My Neighbors the Yamadas”), “Roca” follows teenagers Roca, an aspiring fado singer, and Mino, the daughter of a small-time yakuza, who develop a close connection. But as Roca’s musical ambitions begin to take shape, Mino’s increasingly dangerous activities threaten to pull them apart, forcing Roca to choose between her future and the person who has always protected her. Blending comedy and music, “Roca” will showcase a shift in tone for Fukada while carrying themes of loneliness and human connection explored in his past films.…