These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Late in Chapter One when Kaname opens a present only to find the harisen that she used so often for beating Sousuke.
Early in Chapter Two. Largely due to the author planting a mental image of Kalinin dressed up like Santa Claus in the minds of readers.
Early-ish in Chapter Three when Tessa says "Kaysh mirsh solus" (his braincell is lonely) about Kurz.
Kaname describes Sousuke as having invaded her heart without her noticing... causing Tessa to come up with a mental image of a chibi-Sousuke with a Ka-bar in his teeth, digging a foxhole in a pink heart-shaped island.
Heartwarming Moments: At the end of Chapter One, when Sousuke gives Kaname her birthday/Christmas present.
Garon has one of his first shown semi-early in Chapter Three when he offers lessons in "manners, the good Mando'ad way."
Nightmare Fuel: The story starts out with your run-of-the mill seriousness, and even a few lighthearted moments. But let's face it. As Baker's guilt and PTSD starts to get to him, he starts seeing some pretty scary stuff. Like when the face of a child Baker rescued only to die in the next mission flashes on your screen, or when the battle field literally starts turning red and looking like the pits of Hell as you fight off incoming tanks.