Vocabulary
フラグが立つ
フラグがたつ
to have a flag set (indicates the setting of a variable that determines, for example, how a game will end)
expression
verb
Example sentences
ちなみにここ一週間（いっしゅうかん）は、例（たと）えばフラグが立（た）っていようとも、Ｈシーンが無（な）い事（こと）は確定事項（かくていじこう）だからな。暫（しばら）くの間（あいだ）、辛抱（しんぼう）な！
By the way, this week - no matter what flags are set - it's a certainty that there will be no ecchi scenes. You'll just have to bear with it a while.