Are any of these servers what you are looking for?

Servers with "skullsaba" and "L4D2" in the name:
skullsaba.jp L4D2 Server #F2-06 (JPONLY)
skullsaba.jp L4D2 Server #F3-04 (JPONLY)
skullsaba.jp L4D2 Server #F3-11 (JPONLY)
skullsaba.jp L4D2 Server #F3-06 (JPONLY)
skullsaba.jp L4D2 Server #F3-08 (JPONLY)
skullsaba.jp L4D2 Server #F3-13 (JPONLY)
skullsaba.jp L4D2 Server #F3-05 (JPONLY)
skullsaba.jp L4D2 Server #F3-07 (JPONLY)
skullsaba.jp L4D2 Server #F3-10 (JPONLY)
skullsaba.jp L4D2 Server #F3-12 (JPONLY)