Sin, Crime
independent noun
If you have guilt then you have committed a sin or crime. Come here and confess to Father Koichi.
つみ
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word: When you come to confess your sin to me, you start claiming it wasn't you. You say it was some other version of you! What? How could this be? Well, you say "there are two mes (つみ) out there!" One is doing the bad stuff, and the other is you, and you haven't done any sins!
私のプリンを勝手に食べた罪は重いよ！
The sin of eating my pudding without permission is serious!
それが、せめてもの罪ほろぼしのつもりだったんです。
That was meant as a small act of atonement for my crimes, at the very least.
あのユリちゃんを泣かせるとは、アイツも罪な男だねぇ。
Making Yurichan cry like that, he's a very sinful man.