s.e.m (idolmaster)

An idol group of former teachers working for 315 Production in [[idolmaster_side-m| THE iDOLMDanbooru user STER=STER]: SIDEM]]. The group consists of Hazama Michio, Maita Rui, and Yamashita Jiro.

The acronym stands for their teaching fields: Science, Mathematics, and English respectively.