For thousands of years, Japan has been protected by five clans wielding barrier-weaving magic. Born to a branch family of one such clan, eighteen-year-old Hana has always been stuck in the shadow of her more capable, beautiful, and popular twin sister. When a strong power awakens within Hana, she chooses to hide it so she can continue living a quiet life out of the spotlight. But that ideal lifestyle begins to slip out of reach when Saku Ichinomiya takes over as the new head of the Ichinomiya clan and sets out to find a bride strong enough to stand by his side. Eager to keep her abilities secret, Hana steers clear of Saku... but will she be tempted to sign a marriage contract if it guarantees the peaceful, quiet future of her dreams?

Hana held up her end of the deal and is ready to follow through with the get married, repair the barrier, get divorced, and cash in on a big payday! However, Saku has caught feelings for Hana, and he deviously changed the terms of their contract. He’s not letting her divorce him that easily, as he’s on a mission to persuade her to reciprocate his feelings. While Hana is trying to dodge his steamy advances, trouble rears its ugly head. Twins from the Nijouin clan turn up and make it incredibly hard for Hana to lay low at school. Things with her own twin, Hazuki, are as tense as ever. And to top it all off, terrorists are wreaking absolute havoc, and Hana may have to reveal her power in order to stop them!

Hana’s had her hands full. She’s keeping her husband’s advances at bay, sent a terrorist organization packing, saved the school from destruction, and rescued her twin sister from the clutches of their terrible parents! At this point, flying under the radar is simply impossible. News about her has spread far and wide, finally reaching the ears of an Obsidian rank practitioner named Yukizasa Sankourou. He’s an old friend of Saku’s and is vehemently opposed to his buddy’s marriage to Hana. He won’t stop at just voicing his opinions either, he’s willing to meddle and he’s not above teaming up with the Ichise parents in their continued efforts to get Hana out of the picture.