[request] Somes old games by company "BELL-DA"

Hi,

I'm looking for somes japanese games made by the company "BELL-DA", they quite old and can't find them anywhere.

Here's the titles I'm looking for :
Original Title: ほたる
Romaji: Hotaru
Released Date: 1998/12/10
Company, Producer: BELL-DA
Getchu link: http://www.getchu.com/soft.phtml?id=680

Original Title: Nineteen−19−
Released Date: 1998/04/03
Company, Producer: BELL-DA
Getchu link: http://www.getchu.com/soft.phtml?id=429

Original Title: さや/すみれ
Romaji: Saya / Sumire
Released Date: 1997/10/03
Company, Producer: BELL-DA
Getchu link: http://www.getchu.com/soft.phtml?id=344

Original Title: なお
Romaji: Nao
Released Date: 1997/07/01
Company, Producer: BELL-DA
Getchu link: http://www.getchu.com/soft.phtml?id=686634

Thanks in advance :)