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Xuanyuan Yue, who traveled into the world of "Guarding Sweetheart", was bound to the "Dimensional Guardian System" as soon as she opened her eyes, and became a mission chosen by fate. She thought she would just complete the system tasks and repair the dimensional cracks, and then she would be able to leave in style. However, she unexpectedly broke into the guardian camp of Holy Night Academy and bumped into the energetic Hinamori Amu, and the silver-purple short haired and smiling eyes Tsukiyomi Kito. The system tasks are intertwined with the daily life of the campus, and the villain's purification operation and the youthful heartbeat collide. When the hidden dimensional messenger arrived with dark energy, when the shadow of the super villain enveloped the city, and when the light of the soul egg was in danger, Xuanyuan Yue discovered-- She is no longer a passerby in this world. The bond of her partners is her sharpest weapon, and the protection of her lover is her warmest armor. From under the cherry blossom trees of Holy Night Academy to the parallel world across dimensions, Xuanyuan Yue takes the system and partners, in the name of "Dimension Guardian", to write chapters of love and protection in battle after battle. This is a campus adventure that travels through the + system, and it is also a sweet love song about bonding and growth. When system tasks meet your heartbeat, let's see how the host master defeats monsters and upgrades while reaping exclusive romance.