Kunugi Kou is in a bad place.
The Ayase Hikari problem has been resolved, in theory, but the price he paid to do so was steep in both a physical and emotional sense, and many questions remain unanswered—questions that Kou, by and large, hasn't even thought to ask yet. Much as he'd love to return to his comfortable place in Kaito's shadow, the world isn't quite done making everyone's favorite wannabe sidekick suffer, and that's not even starting on the other world.
Who exactly are Balrog and Rei? How did Kou meet them, and how are they involved in the trauma he still has yet to overcome? What social cues is Kou failing to read in his current world, and how will they come back to bite him in the ass? These questions and more may (or may not!) be answered in the ever-chaotic second volume of The Sidekick Never Gets the Girl, Let Alone the Protag’s Sister!