The trio is scheduled to make their major debut in June 2021.
On February 1, at the first concert of E-girls' final tour E-girls PERFECT LIVE 2011▶2020, Yokoi Rui, Yamashita Yuna and Sato Hinata were introduced as 3 vocalists of LDH's new girl group "iScream".
On February 19, it was revealed that the three vocalists of the group would be in charge of the ending theme song titled "Maybe...YES" for the Amazon Prime Video drama Ochanigosu. starring Suzuki Nobuyuki.
On April 22, the debut date of the group with their first single "Maybe...YES EP" was announced as June 23, 2021. Additionally, the group pre-released the title song of the single digitally on June 1.
- Tours featured in
-  E-girls PERFECT LIVE 2011▶2020 (Opening act)
- The art visual was drawn with an airbrush by artist Yamaguchi Harumi, a pioneer of realistic illustration.
- HINATA is the only member that was not part of EXPG Lab and its project group KIZZY.