Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Name the romaji by your side ~hikari's theme~ (popup.version)

### Inputs:
table_name: table, columns: ['#', 'Japanese title', 'Rōmaji', 'Japanese translation', 'Vocalist', 'Episodes used']

### Response:
SELECT Rōmaji FROM table WHERE Japanese translation = By Your Side ~Hikari's Theme~ (PopUp.Version)