Eden finds Yukkin strangely endearing. He's not as loud or chaotic as the crowds he usually finds himself in, so he doesn't mind the quiet company every now and then. He feels a small, unnatural urge to help and protect him, though, and he doesn't know how to feel about it.
Eden finds Nozomi to be incredibly irritating. She doesn't leave him alone whenever she's in his general vicinity. She doesn't seem to understand his need for personal space, either. Cry seems to like her energetic nature though, in spite of Eden's obvious resentment.
While out exploring, Yukkin came across the valley Ririka lives in. Their friendship was quickly founded on a basis of swapping sweets for stories. His genuine interest and willingness to listen was so endearing she would share even stranger stories then her adventures.
Emery is a good influence on Yukkin in getting him out and exploring as he wishes. He loves nature and how her curiosity balances out his timid side. Where he might hide in his shell, she insists they turn over everyone to find the snail inside.