Sei-Lan is an Instructor of Sensitivity in the Angelique universe. Her specialization lies in guiding the protagonist's mastery over the essential elemental forces known as the Sacrea of Darkness, Water, and Dream. This instruction is vital for nurturing the continent and increasing its Happiness ratings. The character also appears in the OVA *Angelique: Twin Collection*, a production structured around music clips and animated dramas for its cast.