This is a pretty cute manga that didnt really sell in the importance of tattoos by words alone. But I suppose the mangaka wanted to keep the story strictly in two settings, but that only made the whole thing feel to constrained for such a broader topic used. But it weaved three stories really well.
I think all these stories could theoretically happen and all the comments are day that it was boring or that their relationship was stupid but the author took time and effort to make their vision come to life and we shouldn't judge them so harshly when they went to so much effort.
Hmmm ... well, it was an ok read. It was more Shounen-ai than yaoi. The art is sooooo not my taste, and the story/plot was angsty with not a great deal of happiness for anyone. It does eventually have a happy, if somewhat abrupt, ending.