|First Rap Battle|
|Start Date||May 16, 2018|
|End Date||December 13, 2018|
The First Rap Battle was the first installment of the Battle Season series that took place on May 16, 2018, with the release of WAR WAR WAR, and ended on December 13, 2018. The winner was Matenrō, with over 53k votes.
- The end of the Division Battle Anthem video announced the first rap battle and release date for the Buster Bros!!! VS MAD TRIGGER CREW album.
- WAR WAR WAR is released on May 16, 2018, officially starting the first rap battle.
- The second song for the rap battle, BATTLE BATTLE BATTLE, is released on July 16, 2018.
- The first voting system was by buying merchandise and CDs.
- On August 26, 2018, the first voting results were released.
- Buster Bros!!!: 32812
- MAD TRIGGER CREW: 32943
- Fling Posse: 35479
- Matenrō: 40936
- MAD TRIGGER CREW and Matenrō went to the finals.
- DEATH RESPECT is released on November 14, 2018, starting the finals.
- The second voting system was by buying the MAD TRIGGER CREW VS Matenrō album. Those who bought the album were guaranteed a code to vote between the two divisions.
- On December 13, 2018, the results of the finals were released.
- MAD TRIGGER CREW: 52840
- Matenrō: 53769
- The first rap battle ends.
- Matenrō's victory CD, The Champion, is released on February 27, 2019.