Senior Kouichi Mizuki is about to take his final exams and graduate from high school, when he suddenly finds himself in a world of titans. Not only is he no longer anywhere near home, but one of these giants, Prince Caius, has claimed Kouichi as his bride! Thanks to a disturbing, world-ending prophecy, the prince's upcoming nuptials cannot be with anyone of his world. Since Caius has no plans to send Kouichi back to earth, he is wholeheartedly set on taking Kouichi as his "wife"!

"It's like a small fruit..." The Titan's large hands grasped my thing easily with one hand... With the difference in our size, if we go all the way, I'm definitely gonna die...!?

Kouichi has made the painful decision to return to his world. With their agreement satisfied and his decision made, Caius begins the magical process of sending him back. However, as the process begins, Kouichi watches as Caius' physical form begins to fade. Unable to help him or ask why, the couple is dragged apart. What is wrong with Caius, and who, if anyone, will be able to help Koichi in his hour of need?!

Kouichi and Caius have been caught up in a beastman's trap! While traveling through Foval looking for the illusive Raisa fruit that will cure Kouichi of his raging illness, Caius certainly doesn't expect an ambush. Some shady beastmen think they'll be an easy heist, but unfortunately for them, stealing Kouichi away was the worst choice these thieves could ever make. As a captured Kouichi still suffers through the unbearable heats brought on by the karina fruit, he's left to wonder--will he...

Hoping to find a solution to their marriage bed problems, Koichi and Caius head for Alpheine, land of the elves. There they meet Rayle, a sex researcher, and Dyne, a mysterious masked giant. With Rail's guidance, the couple learns more about one another, and Koichi decides to pick up a new skill: magic!

The deadline for Kouichi's bridal challenge is fast approaching, and though he's made a bit of progress with the egg he's supposed to hatch, it won't be enough to secure victory. It's time to think outside the egg, and with that in mind, he sets out to find new allies to aid in his quest. Meanwhile, Baro works with the guild, where he discovers new truths. But the question remains: Is he working undercover, or has he gone fully rogue?

Kouichi has narrowly escaped an assassination attempt on both himself and the egg he's protecting as part of his bridal challenge, and learned that the plot to keep the egg from hatching involves the Featherlings. Prince Marteba, previously close-lipped about their family's circumstances, now tells Kouichi the complicated truth, which turns everything on its head. With time running out, Kouichi makes one last attempt at getting the egg to hatch, but will it be too little, too late?

Kouichi has accepted the challenge: hatch the unhatchable featherling egg. To do that, he'll need to use every last ounce of wit he has and learn more about all the different races of people around him. Meanwhile, Caius tangles with the Tildant political crisis. As their love for one another deepens, villains work in the shadows, vowing to tear them apart...

The brazen attack on both Kouichi and the featherling egg sends shockwaves throughout Tildant. Everyone wants to know who's behind the assassination attempt--and for what nefarious purpose it was carried out. Meanwhile, as Caius gets even more entangled in the politics of his station, Kouichi continues his magic training and egg-sitting duties. Despite the chaos, their love life is stronger than ever... and could even pave the way to victory for both of them!

Somehow, Kouichi has been pulled into Tildant's succession crisis and is targeted by Tildant nobles, accused of being an unworthy partner to a king. Wanting to protect his beloved Caius and prove himself to the court, Kouichi accepts a challenge to prove his worth once and for all!

"It's like a small fruit..." The Titan's large hands grasped my thing easily with one hand... With the difference in our size, if we go all the way, I'm definitely gonna die...!?

"It's like a small fruit..." The Titan's large hands grasped my thing easily with one hand... With the difference in our size, if we go all the way, I'm definitely gonna die...!?