Last year, I was introduced to an anime by the title of "Uchoten Kazoku"（有頂天家族...The Eccentric Family）. The tale of a family of shape-shifting tanuki in modern-day Kyoto as they balance their lot between daily life in the former ancient capital and the fears of getting set upon by enemies comical and beautiful (including being eaten in a stew), admittedly it wasn't a show that grabbed me immediately despite the gorgeous scenery since I had to struggle with the story sans subtitles. However, since getting the entire series as a present, I've been able to enjoy the anime at a more leisurely pace and therefore appreciate it a whole lot more.
One of the reasons that I have enjoyed the show is the ending theme by the group fhana. Amongst the number of anime I've seen, this is a group that I've seen fairly often taking care of various opening and ending themes, the latest being the openers for "Witchcraft Works" and "Gingitsune" earlier this year. However, my favourite theme hands down by fhana has been "Que Sera Sera". According to the J-Wiki article on the song itself, it's been getting a goodly number of accolades including this one: "There hasn't been an ending theme that fits an anime as well as this one does."
I don't think I have seen anywhere near the number of anime that would ever make me that authoritative when it comes to that opinion. However, I can certainly understand that commenter's point of view. The bright and sweet vocals by towana along with the cheerful if somewhat introspective melody mesh wonderfully together, and they both work perfectly with the lovely ending credit visuals. And the title itself of "Whatever will be, will be" (yep, I'm old enough to have the Doris Day record of the same title) kinda goes hand in hand with how the characters in the show seem to deal with most of their crises.
One of the commenters at YouTube mentioned that "Que Sera Sera" sounded a bit like the famous theme for "Merry Christmas, Mr. Lawrence" by Ryuichi Sakamoto (probably the intro). I can also add that some of the arrangement harkens back to some of the dance groove about a decade ago used by singers like bird and Misia.
"Que Sera Sera" was composed by fhana leader and keyboardist Junichi Sato （佐藤純一）and written by Hideki Hayashi（林英樹）. Released in August 2013 as the band's first single, the song didn't go any higher than 111th place on Oricon, but that won't dampen any of the fans' enthusiasm.
As for the group itself, the story leading up to the current lineup reads as if it also deserves its own time on the small screen. Sato, who originally came from the band FLEET, started getting into a Twitter friendship with guitarist yuxuki waga from s10rw at the end of 2009. Then almost a year and a half later, the two of them met sampler Kevin Mitsunaga from another band, Leggysalad, at an event. From there, the three supposedly cemented the concept and direction for fhana at a maid café (hey, where else?). Initially, fhana had thought about having just guest vocalists do the singing but since they were so impressed with one of their invitees, towana, she just became the permanent vocalist. And the band was officially in business from 2012.
January 15 2016: I've finally gotten the article up for the opening theme "Uchoten Jinsei"（有頂天人生）by duo milktub.