Developer Page: Bestmedia
(dev id no. 19 - prev next)

As the name suggests, they're not just a games development company, also doing stuff like web, mobile, DVD, and other non-game software. And their game output doesn't seem too interesting, amounting to a quiz and an adventure game and about five Simple titles, so I'll leave it there.
Official Site:

Simple 1500 Series
The Sniper (with Sol), The War Simulation ~Jin no Sourishimono Tachi~ (with Sol), The Onigokko (with Sol)

Simple 1500 Jitsuyou Series
Kurashi no Manner ~Kanninsousai Hen~ (with Sol)

Simple 2000 Series
The Sniper 2 ~Akumu no Juudan~ (The Sniper 2) (with X-Road), The Survival Game (Light War) (with X-Road), The Fantasy Renai Adventure: Kanojo no Densetsu, Shimobe no Sekiban (with X-Road), The Konchuu Saishuu (with X-Road), The Survival Game 2

Simple DS Series
The Genshijin

Simple 2000 Series 2in1
The Bushido ~Tsujigiri Ichidai~ & The Sniper 2 ~Akumu no Juudan~ (with ALU)

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