私×義弟（おとうと）×女子高生姿の私＝三角関係!!?　――ある日、ノリで友達の高校時代の制服を借りて街に出た湊（みなと）はそこで義理の弟・透（とおる）と遭遇してしまう!!　別人だと言い張る湊を信じた透だけど、透はその「女子高生姿」のほうの自分に惚れてしまったみたいで……!!?　世にも奇妙なラブストーリー開幕！

義弟×私×あこがれの人＝禁断の同時進行!!?　まさかの……モテ期なのか!!?　高槻湊（たかつき・みなと）20歳。友達の高校時代の制服で変身中、義理の弟・透（とおる）に別人として惚れられてしまい、その透の一途さに押され、一度つきあうことに……！　しかし、タイミング悪く小学の時のあこがれの人・烏丸（からすま）くんからも告白をされてしまって!?　話題沸騰！　二重恋愛コメディー第2巻！

ワケあって今……弟に片想い中です（※この文章には微妙に「嘘」が含まれてます）。－－私×義弟（おとうと）×私＝つらい片想いの始まり……なのか？高槻湊（たかつき・みなと）20歳。友達の高校時代の制服で変身中、義理の弟・透（とおる）に別人として惚れられてしまい、一度つきあうことに……！だけどあこがれの人・烏丸（からすま）くんとつきあうため、透との関係は終わらせた湊。しかし、透のあまりの落ち込みように再び……！？

While trying on her friend’s old high school uniform and pretending to be someone else, the 20-year-old Minato Takatsuki unwittingly attracts the affections of her younger stepbrother, Toru, and decides to go out with him! Next, hoping to get Toru to like her as a sister, Minato breaks up with her crush, Karasuma-kun, and gives it her best shot with Toru, but…? How scandalous! The fourth volume of the split personality romantic comedy!

高槻湊21歳。友達の高校時代の制服で変身中、義理の弟・透に別人として惚れられてしまい、つきあうことに…! 次第に姉の自分として透を好きになってしまった湊だけど、あこがれの人・烏丸くんに秘密がバレたり、塚口先輩が自分を好きと知ったりで…!?話題沸騰! 二重恋愛コメディー第5巻!

Toru has started to integrate himself with the club, closing the distance between himself and his sister, Minato, but it seems that her ex, Karasuma-san, still has regrets...and decides to use the information Minato shared for his benefit? Was Karasuma-san a different person all along, or is he just now becoming an imposter? The web of love continues to unravel in volume 6.

Mina and Toru finally end their relationship?! And Toru has finally found his special someone?! Meanwhile, Minato is looking to move out and face the future head on, all while running away from the present. The web of lies keeps weaving in volume 7.

Minato has finally come clean with Toru! What does this mean for the couple from here on out? Will Minato spin this off as another joke? Are there any options for them and the road ahead...and what will their family think? The web of lies unravels just a bit more on this rocky road in volume 8.

Minato's largest and lie is finally exposed! Will this drive a wedge between her and Toru or bring them closer together? The lies both of them spread are laid bare at last. And even if Toru accepts Minato after everything she's done, what about everyone else? The truth starts to unfold in Liar x Liar volume 9.

Minato and Toru have finally come clean to not only each other, but those around them! With only the truth remaining, their family and friends come forward to support this budding couple, and as things wind down, their friends start to face their own futures after graduation as well. The heart of things is revealed in the 10th and final volume.