Question: Name the romaji By Your Side ~Hikari's Theme~ (PopUp.Version)
SQL: SELECT "Rōmaji" FROM "1-2144389-8" WHERE "Japanese translation" = 'By Your Side ~Hikari''s Theme~ (PopUp.Version)';

Question: Name the vocalist for Kaze no Messēji (PokaPoka-Version)
SQL: SELECT "Vocalist" FROM "1-2144389-8" WHERE "Rōmaji" = 'Kaze no Messēji (PokaPoka-Version)';

Question: Name the least number for  君のそばで～ヒカリのテーマ～(PopUp.Version)
SQL: SELECT MIN("#") FROM "1-2144389-8" WHERE "Japanese title" = '君のそばで～ヒカリのテーマ～(PopUp.Version)';

Question: Name the number of vocalists for  Which One ~ Is It?
SQL: SELECT COUNT("Vocalist") FROM "1-2144389-8" WHERE "Japanese translation" = 'Which One ~ Is It?';