Ikimonogakari will release their new song "Taiyou" on their major debut anniversary day, March 15. 

Ikimonogakari halted their activities and entered a 'grazing period' on January 5, 2017, then resumed their activities on November 3 of last year. "Taiyou" was distributed to fans who remained in the group's fan club during their 'grazing period.' It's the first song that the three members wrote and composed together.

Source: natalie