We all know the disaster that happened last March 11 in which Japan was devastated by a magnitude 8.9 earthquake which was followed by a tsunami. That is why, manga artist such as Slam Dunk's Takehiko Inoue drew a series of art works (on top) which depicts people smiling hours after the said incident to offer his prayers for Japan for its recovery.

He is part of a large movement in Twitter called, #draw_for_japan in which various artist offer their support to the victims in their own in way, in this case, by art.
Source: Kotaku Japan via Anime News Network (Link 2)