訓 せ(める) ・ 音 セキ
漢越音: trách
The shell 貝 (money) sits at the bottom: the original sense is demanding a debt. Pressing someone to pay became blaming them, and then the duty owed: sekinin, responsibility.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
責任は私にあります。 (せきにんはわたしにあります)
The responsibility is mine.