Yes Little Busters! doesn’t really have a canon otp like other Key works, but I always though Rin was considered LB’s main girl. Like, she clearly stands at least a peg above the other characters with her being a childhood friend of Riki and the only girl that isn’t recruited over the course of the story, being the only girl not directly involved with the secret of the world, having 2 routes (Rin and Rin2), and in general going through character development similar to Riki’s (although much more watered down). She is also a the only girl that plays a role in the other character routes and in general is treated very similar to Riki from a storytelling perspective. Riki and Rin don’t necessarily end up together but I don’t think being on the protagonist’s dick is a prerequisite to being a main girl.
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