  Flares are known to play an important role for the evolution of the
atmospheres of young planets. In order to understand the evolution of planets,
it is thus important to study the flare-activity of young stars. This is
particularly the case for young M-stars, because they are very active. We study
photometrically and spectroscopically the highly active M-star 2MASS
J16111534-1757214. We show that it is a member of the Upper Sco OB association,
which has an age of 5-10 Myrs. We also re-evaluate the status of other
bona-fide M-stars in this region and identify 42 members. Analyzing the
K2-light curves, we find that 2MASS J16111534-1757214 has, on average, one
super-flare with E > 1.0E35 erg every 620 hours, and one with E >1.0E34 erg
every 52 hours. Although this is the most active M-star in the Upper Sco
association, the power-law index of its flare-distribution is similar to that
of other M-stars in this region. 2MASS J16111534-1757214 as well as other
M-stars in this region show a broken power-law distribution in the
flare-frequency diagram. Flares larger than E >3E34 erg have a power-law index
beta=-1.3+/-0.1 and flares smaller than that beta=-0.8+/-0.1. We furthermore
conclude that the flare-energy distribution for young M-stars is not that
different from solar-like stars.
