Bloody Monday (2008)

Both have crime, mystery and a dash of scifi, even though circle is a bit more heavy on the scifi and quite more fast paced. Both dramas are also about people struggling against corrupt/underground organizations planning to make the world a "better" place.

They are both based on horror/psychological thriller manga, both follow the idea of a hero or group of heroes trying to uncover and catch a mastermind who wants everyone dead, and despite the similarities, the stories vary greatly in many ways. Plus, Ousama Game is one movie instead of a series, so you won't be wasting much time if you happen not to like it!

If u're action lover than those two dramas share that fact along with great events

Both shows have a lot of suspense and action. The story is about a teenage boy that is involved (because of blood ties (in HTE) or by being a talented hacker (in BM)) in a struggle of law enforcement against terrorists. In both shows the protagonists gradually, step by step, find out the real intentions of the criminals and (may be) "save the world" in the end.

There is the same atmosphere like in Bloody Monday, there is an incredible suspense which plays with spectators on their attention and ability to predict next step.

Both are japanese drama with lot of similarity .. They revolves around secret organizations, international threats and crime .. both of them give the same vibe of suspense and action ")

Both shows are psychological thrillers where the bad guys want to change a "fallen" Japan by singling out their "chosen ones." Both are more centered upon the mysterious plot than any romantic themes. Part terrorism, part friendship; the stories give a little bit of the same feel. Fallen Angel is shorter though and a little bit less in depth/drawn out.

They both are mostly different but the feeling is similar. They both have that hacking vibe and a somewhat suspense

while the plot line is very different, both are action packed and suspenseful. After watching Bloody Monday I was anticipating another show that could have as much adrenaline and suspense. Ouroboros is the only other show so far that has come close to being as awesome as Bloody Monday.