[Machine Translation] The theme song for the TV Asahi drama "Age Harassment" (starring Emi Takei), Chihiro Onizuka's much-talked-about debut single "Summer Crime" was followed by her second single, the first single of 2016! Compared to her debut single, which sings of an adult's worldview, this new single is a refreshing message song that will resonate with the same generation and showcases her life-sized charm to the fullest! The coupling album also features three new songs, including "Pray for you" and "Tsuyoi kokoro", both of which are already popular at her live performances. The limited first edition includes a DVD with the music video of "Birthdays" and the making of the song. Premium ticket (event ticket + present application ticket) is enclosed.