JE News Daily (English)
It seems really strange for Yamapi to be doing the theme song for this drama when he is not in it at all as far as we know. At least with Kis-My-Ft2 doing the theme song for Shiritsu Bakaleya Koukou they had one of their group members in the show, even though the role was small. In fact going from that it would have made more sense for Kisumai to have the theme song for in the Room with Senga Kento being in the drama.
I guess there are somethings about Johnny's I will never understand.
I do think the title of the song is a bit interesting though. with the 'sera sera' part it immediately had me think of the English song, Que Sera Sera. I wonder if there will be a connection with the two songs because if there is I think it might at least be a fitting song for the drama as it is about letting worries go and from what we know of the drama the students coming to Inagaki Goro's character are full of worry over different matters in their lives.