Table schema:
CREATE TABLE table_2144389_8 (_number INTEGER, japanese_title VARCHAR)

Question: Name the least number for  君のそばで～ヒカリのテーマ～(popup.version)
SQL: SELECT MIN(_number) FROM table_2144389_8 WHERE japanese_title = "君のそばで～ヒカリのテーマ～(PopUp.Version)"