Tatsumi experienced the devastating death of his family in an accident during his senior year of high school. His beloved cockatiel, Chiko, died of old age as he struggled to come to terms with this utter loss. Tatsumi was on the verge of giving up when he got summoned to another world. There, Chiko was waiting for him, much to his confusion. Resurrected as a dazzling young girl, she was worshipped as a saintess by many, making her unrecognizable to him. And to Tatsumi's shock, she had decided to make him her fiancé! But not everyone wanted to honor their union. The two quickly realized that they were at the center of a complex plot when opposition erupted. Join Tatsumi and Chiko as they embark on this moving journey of love and resilience.

Healed from the wounds of the battle with Morganaik, Tatsumi devoted himself daily to sword and magic training to become a man worthy of Chiko. Finally, he was appointed as a Temple Knight. Meanwhile, his cohabitation with Chiko was proceeding smoothly, and their relationship started gaining recognition among the people, causing him to seriously consider the concept of "marriage." Amidst this celebratory mood, a great evil suddenly appeared, intent on stopping their marriage! With a grown heart and body, Tatsumi was determined to protect his beloved Chiko!

Having finalized their engagement, Tatsumi and Chiko's lovey-dovey relationship accelerates even further. During this time, they decide to start their activities as demon beast hunters and head to a tavern where subjugation requests are gathered. To their surprise, the proprietress of the place is a beautiful elf woman who had once been transferred from Aichi Prefecture in Japan! Tatsumi, finding a connection with someone from his homeland, engages in lively conversation and even gets introduced to new companions, deciding to go on a hunt. However, they soon find themselves facing a demon beast far stronger than any they have encountered before, putting Tatsumi and Chiko in a desperate situation! —Once again, their lovey-dovey power is put to the test!

Tatsumi had grown immensely, both as a Shrine Warrior and a Magical Beast Hunter. His life now felt complete, filled with purpose and love, with Chiko always by his side. As the New Year approached, a grand festival was being prepared across the nation, and the two were asked to help with the celebrations at the Savaiv Temple. The excitement in the air was palpable, with preparations in full swing. During the event, the mischievous elder Giuseppe leaned over and whispered a plan into Tatsumi’s ear. Inspired by the idea, Tatsumi decided to create a once-in-a-lifetime surprise—something that would not only amaze Chiko but also involve the entire city. With his heart racing and courage swelling, Tatsumi turned to Chiko and asked her the question that would change their lives forever.