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夢中， むちゅう
1. absorbed in, immersed in, crazy about, obsessed with, devoted to
2. forgetting oneself, daze, trance, ecstasy, delirium
3. within a dream, while dreaming
tbd
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd