Mika is a member of the idol unit "Valkyrie", alongside Shu. He refers to Shu as "Oshi-san" because he sees him as a teacher and admires him and his art. Despite his perfectionist and artistic idol unit, he's quite clumsy and silly at times. But he always does his best, even if it means overworking. This is the reason he ignores his own mental and physical health without noticing. He doesn't really take his personal problems seriously and brushes them off so that no one gets worried.