Since "105" likely points toward the final stretch of the second cour, here is a refresher on the high-stakes finale: Episode 21 (Part 2, Episode 10): "All That's Left"

The anime adaptation of 86 Eighty-Six , produced by A-1 Pictures, is divided into two parts (or "cours"). Episodes 1 through 11. Part 2: Episodes 12 through 23.

Lists the series as a single season with 23 episodes.

This is the emotional and technical peak of the "Morpho" hunt. Shin faces off against the Legion's railgun in a desperate, suicidal charge. The episode is famous for its incredible sound design and the "shards" visual effect that represented Shin’s fractured mental state. Episode 22 & 23: The Grand Finale