The 2nd EP "Cosine" with a total of 5 songs by O-BEATS that expresses what you experience in your daily life. The theme is the joy of comrades who spend their lives together all the time, and the conflict, anger, and sadness that they feel from the problems and events that sometimes occur. For guest performances, Rin¥a Michigucci in "Cosine" which is also the title of this work, 4th Street Park, local old friend U-echi and Jelly One in "Payback", and the same for "Hunter" 9Yawh from the members of , and TAKTY-E, which also became a hot topic in the song "Baby Jane", are participating.