大学のサークルで麻雀したり宅飲みしたりといつも仲良くしてる龍驤大先輩と掛け麻雀で勝ってえ○ちさせて貰ったり彼女になって貰う概念です（天下無敵）

The idea of always getting along with Ryūjō-senpai in our university club—playing mahjong, having drinking sessions at home, winning at gambling mahjong, and getting to do naughty things with her, then making her my girlfriend (top-tier fantasy)