CREATE TABLE table_name_54 (theme_song_s_ VARCHAR(255), japanese_title VARCHAR(255))
Which Theme Song(s) has a Japanese Title of 恋におちたら～僕の成功の秘密～?
    
SQL: SELECT theme_song_s_ FROM table_name_54 WHERE japanese_title = "恋におちたら～僕の成功の秘密～"