Japanese with Manga

Speaker's conviction with

Grammar: Unexpected » 〜た＋つもり

After a past-tense verb, つもり can say that someone acted under the belief that they had done something, even when reality differs: “thinking that I had ~”.

Further Reading

Examples

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Suppressed presence with 〜た＋つもり

Grammar Explanation: Speaker's conviction with 〜た＋つもり

Manga panel from ご注文はうさぎですか？ showing example of Suppressed presence with 〜た＋つもり.
ご注文はうさぎですか？ » Volume 1 » Page 14

While changing into her uniform, Rize hid in the closet when she sensed someone unfamiliar nearby. Cocoa, feeling as though she was being watched, opened the closet door.

ココア:
「下着(したぎ)姿(すがた)の…ドロボーさん？」
“A burglar… in their underwear?”
リゼ:
「完全(かんぜん)に気配(けはい)を殺(ころ)してたつもりなのに」
“I thought I completely suppressed my presence, and yet...”