配牌を開いた瞬間に勝利を確信する圭一なのです

Keiichi confident in his victory at the moment there's an opening in the dealt tiles.

<tn>*Normally <i>Higurashi no Naku Koro ni</i> is written ambiguously, so that "Naku" can refer to crying in the sense of weeping or an animal making sound. Here it's been written with a kanji that unambiguously means the former.</tn>