This is more evident in the second OVA where she wonders if he would marry her if they were not blood related, and in the manga where she blushes every time another character mentions her brother, and also in the 5th OVA where after being hit by the pollen she tries to molest him while affectionately calling him "Onii-chan".
Ini lebih jelas dalam OVA kedua di mana dia bertanya-tanya apakah dia akan menikahinya jika mereka tidak berhubungan darah, dan di manga di mana dia merona setiap karakter lain menyebutkan saudara laki-lakinya, dan juga di OVA ke-5 di mana setelah dipukul oleh serbuk sari dia mencoba untuk menganiaya dia sambil sayang memanggilnya "Onii-chan".