Hatsune Miku and Megurine Luka were inseparable as they grew up together. When a young orphan named Kaito arrived at a nearby children's home, Miku and Luka warmly welcomed him into their circle and made a pact to always be there for each other.
But as they grew older, their relationships with each other became more complicated. Miku realized that she was developing romantic feelings for Kaito and confided in Luka about them. To her surprise, Luka revealed that she felt the same way. This put their friendship in jeopardy, as they could easily turn into rivals for Kaito's affections.
Despite the potential for conflict, the two friends were determined to keep their bond strong and resist acting on their emotions. But can they really suppress their desires indefinitely? If one of them gives in to temptation, what will happen to their friendship? The promise they made might not prove strong enough to withstand the test of time.
