The new single was released 3 days ago. I completely forgot about it
I gave the longer previews on iTunes another listen, but this single just doesn't really do it for me. The songs are nice, but I don't like them enough to actually buy them.
I'm less critical about the lyrics now, though. Although I can't relate at all, I can appreciate how the songs are nicely interconnected. Saikou no Shiawase is about falling head of heels in love, but hints at having to hide the relationship from other people. Ai no Kuni makes it clear she's in love with a married man, but she hopes he'll pick her instead. In Maboroshi (which means "illusion") she realises she was being naive, but she's still grateful she experienced love.