Heartwarming Moments: The ending, where Sandra, after 20 years of being unable to talk to her parents, finds her mother (her father had already died of cancer) and her mother, near-death herself, gives Sandra a key. Which unlocks a cupboard where she finds a box. And in the box is her teddy bear, the only thing in her life that has never hurt her.
Ensemble Darkhorse: It's part of a 'personal promise' on the author's part, but Dinosaur Ryuzaki and Insector Haga gained such an increase in role that she had to give them first names lest things get awkward.
And if the spoiler-art for Capmon is any sign, they're about to get an even larger increase.
"Funny Aneurysm" Moment: At one point, Seto tells Jonouchi off by saying that he's so pathetic, that he 'can't even stand on his own two legs', a line that is humorously completed by Jonouchi himself Guess what ended up happening to Jonouchi over ten chapters later.
Alternatively HarsherInHindsight; the reason why Jonouchi can finish the sentence is because he received the same insult from a dream, which was made with the demand that 'even when you cannot stand, to fulfil [his promise]'. Boy, did he ever.