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Why does Oscar ask if silver is a chestnut?

Because Silver likes chestnuts, OSKA wants her back, of course, starting from her preference ~ At the Christmas party in episode 14, OSKA also asked Silver "Is it cheesecake", which means that she doesn't like cheesecake ~ ~ In the last episode, the first box opened when proposing marriage was chestnuts, and the second one was a ring, which also means that chestnuts represent silver.