If you're looking for anime similar to Goulart Knights: Evoked The Beginning Black, you might like these titles.
After a catastrophic epidemic kills every adult on earth, vampires arise from the shadows to enslave the remaining human population. Yuichiro and his friends are kept as vampire fodder in a creepy underground city. Yuichiro dreams of one day fighting back, and the first step is staging a daring escape from their vampire overlords...
The main characters are a part of a military school, that trains students to fight off a supernatural force. For Owari no Seraph, it's to learn how to fight and defeat vampires. For Goulary Knights, it's about defeating mysterious beings known as "Archon's". Both anime have a slight homo-erotic subtext.
On August 20XX, a gate suddenly appears in Tokyo's Ginza district, unleashing a portal where monsters, medieval knights and other fantasy beings come from another world and wreak havoc on Tokyo. The Japanese Defense Force take action against these monsters and push them back into the "Gate". Third Reconnaissance Team is dispatched to the "Special Region" lead by officer (and otaku) Youji Itami. On their travels, they are joined by a beautiful elf girl who is a survivor from the dragon's rampage and guide the group across the dangerous new world.
The anime aren't very much alike, but the beginning of Goulart reminded me of Gate. The similar thing about both anime is their military backgrounds.. and the beginning of Goulart starts with the characters in a Military vehicle, similar to Gate. Both anime employ a military vibe, mixed with magic and fantasy.
Makoto, a gang leader, takes in Minoru Tokito. Minoru has a mysterious past that includes the usage of a drug called W.A. This drug has caused Minoru to have his right arm as a monstrous limb. The two begin their journey by investigating this drug that is tearing up the city's "underground".
A series of pop songs set to animation inspired by, and manga stills taken from, "Yami no Purple Eye", Chie Shinohara's Shogakukan-award winning manga about a girl who discovers she has feline DNA and can turn into a monstrous leopard.
When their village was wiped out five years ago, there were only three young survivors: boys Shino Inuzuka and Sosuke Inukawa and the girl Hamaji. Through a quirk of fate, both boys share the same peony-shaped birthmark. Genpachi Inukai and Kobungo Inuta were raised hundreds of miles away as foster brothers, but they too share the same birthmark. When they went north as part of the army three years ago, they went to confront demons and came back forever transformed. Now the Imperial Church has come for Shino and Sosuke and they must find eight mystical gems and their owners or face a fate worse than death at the hands of the Church.
The journey to find all eight sacred gems continues, as Sousuke and Shino travel in search of the remaining gem holders. From the shadows the Imperial Church continues to scheme, and a mysterious woman seeks to fulfill a sinister plot with the gem holders at its heart. As the origin of the gems comes to light, so does the truth behind Sousuke’s doppelganger, Ao, as he resurfaces with his own goal— one involving Sousuke and his gem!