Suffering from a rare, incurable illness that causes frightening changes to her body, loner Kuroe Akaishi spends her high school days avoiding all her classmates-especially class idol Arata Minami and his groupies. But when Arata starts making her heart skip a beat with irritating regularity, Kuroe discovers that her illness actually has a big-make that MONSTER-secret: Romance turns her into Love-zilla...literally!

All Kuroe Akaishi wants is to live a low-profile life without inconveniencing the residents of Tokyo...That's why she's been maintaining a loner life, after all. But with class heartthrob Arata Minami in the mix, her uncontrollable emotions threaten to wreak havoc on the city once more! What's a lovestruck monster gotta do for a normal love life?!

Despite her best efforts to keep her budding relationship with Insta-famous classmate Arata Minami under wraps, Kuroe Akaishi is thrust into the spotlight-only this time in human form. With the new semester underway, the socially awkward kaiju finds herself attracting all sorts of unwanted attention. Can she handle her newfound popularity...?!

While Kuroe and Minami were planning to announce their relationship to their classmates...eventually...they weren't planning to do it over social media. And they certainly weren't planning to announce it while Kuroe was in her transformed state! Newly dubbed "Kaiju Prince" by his classmates, can Minami withstand the fallout...?!

ついに二大怪獣が激突!? 日本を揺るがす超巨大ラブコメ衝撃の新展開! 感情の高ぶりに呼応して大怪獣へと変貌する女子高生「黒絵」と、同級生のイケメン男子「新汰」。二人の仲がギクシャクしている頃、日本を離れた黒絵の母「凛子」は黒絵出生の秘密を握る地へと赴いていた…。

史上最大の姉妹喧嘩!? 新たな大怪獣がついに日本上陸!! 感情の高ぶりに呼応して大怪獣へと変貌する女子高生「黒絵」と、同級生のイケメン男子「新汰」。お互いの気持ちがすれ違う中、東京に現れた新たな怪獣と対峙するハルゴン=黒絵。そして、彼女の危機に新汰は……。

He knows. After that whole crazy battle over Tokyo with the other kaiju, Minami-kun knows that Kuroe is actually also Harugon-and she’s terrified to find out how he really feels. Fleeing instead of facing him head-on, she ends up back on the island of her birth. But there’s some strange people with masks over there, and it’s kinda hard to tell whether they’re friend or foe...

はるか遠く未開の島で、黒絵は自身の誕生の秘密を知る――。 大怪獣「ハルゴン」へと変貌する女子高生・黒絵は、東京に現れたもう一体の怪獣を退け、自身がハルゴンであることを恋人の新汰に打ち明ける。秘密が明るみとなる危険に晒される中、母・倫子が現れて……。

南の島で、三大怪獣激突――!! 母凛子によって自身の秘密が眠る島へと訪れた黒絵。そこで出会った族長のドラゴと大怪獣「キナラ」。そして生物学者の安蘭。怪獣が生まれたこの島で巨大な陰謀が渦巻き、大怪獣たちが激突する!!