Masamune Okumura is a second-year high school student who serves as the president and only member of his school's manga club. An otaku, he claims he has no interest in real girls due to his obsession with a fictional character named Liliel (リリエル, Ririeru). Suddenly, a first-year student named Lilysa Amano, who is passionate about cosplay, joins the club and recruits Okumura to be her official photographer. When Okumura learns her favorite character is also Liliel, he starts to fall in love with her, making him feel conflicted. Other girls soon join the club as well, including Okumura's childhood friend Mikari Tachibana, whose unrequited love for him constantly leaves her frustrated.
高二學生奧村是校內漫畫研究社唯一的社員兼社長,他對三次元(指現實中)的女性毫無興趣,僅喜愛二次元的女性角色,並特別喜歡角色莉莉艾露。某日他的學妹天乃理理沙來到社團,同樣熱愛莉莉艾露的她與奧村志趣相投,她Cosplay成莉莉艾露,並請奧村協助拍攝寫真光碟。儘管奧村聲稱自己對三次元沒有興趣,但他實在想要同好,便讓理理沙入社並答應她的請求。由於Cos成莉莉艾露的理理沙被奧村視為「2.5次元」,使奧村對自己的信念非常動搖...
*13卷至104話