When high‑schooler Hinata Sunohara was called to a different realm to vanquish the Demon Lord, he vowed to wed Mariabelle, a striking dark elf. Yet after completing his quest, Hinata returned to Earth, leaving Mariabelle heartbroken.
A month later, life in Japan seemed ordinary again for Hinata. Suddenly, Mariabelle appears in his bedroom! Vowing to stay beside him forever, she moves in. Her intense affection deepens daily; Mariabelle seeks to shield Hinata from danger and keep his gaze fixed solely on her. His classmates notice the change, yet he keeps it secret. Mariabelle"s presence brings both joy and tension as she watches over him.
