Well, i never thought about this to be that well written, within every 10-15 min, it just makes you more intense to know about the character like doumeki and yashiro. Yakuza plot is kinda felt good with BL. Just the thing twittering birds never fly I actually came to why this title is given to this story it is because to be caged with the lover which felt romantic. The Characters are damn smart! With very bold texture . And still it's a partial story make sink in suspense pit. An awesome move created by grizzly animation. This is kinda sexist movie but to be Frank the plot is awesome. I don't know why this is underrated.