Kodansha has released a promotional video for the latest OVA spin-off of " Attack on Titan: No Regrets " (Shingeki no Kyojin Gaiden: Kuinaki Sentaku), an OVA that tells the entire origin story of the character Levi Ackerman.
While the second season is being made, it's definitely worth watching the events that run parallel to the main story.
This final episode will be released bundled with volumes 15 and 16 of the main manga; volume 15 was released in December 2014, and the new one will be released on April 9th of this year.
Check it out: