Quote Originally Posted by shinta|hikari
Mirai might inherit some of her younger brother's hobbies as a reaction to his death. It can be a form of adjustment, or a way of remembering him in the future. Maybe then the robotaku Kento ending is possible.
That's the ending I envisioned. They spent quite some time establishing Yuuki's love for robots, why he loves them, how they can save people and all right before he died. At the same time, they showed how Mirai had no future aspirations whatsoever. Only now has she decided to play her "sister" role properly, albeit too late.

Taking on Yuuki's dream as her own is like living her brother's life for him, fulfilling the dream that he couldn't.