like for example after you watch it it still haunts you you cant shake it off, but at the same time you are afraid of losing that feeling. You love it so much to the extend you download its ost and search where are the locations they shoot that drama/movie, you may fall in love with its characters or its plot or you still watch that movie/drama from time to time.
The first that made me feel this is taiyou no uta movie, our science teacher made us watch it at school...Thanks to her I became a fan of japanese cinema, became fan of yui and became fan of japanese countryside. But the drama the stuck in me the longest time is sekai no chusin(crying out loud in the center of the world). That thing made me depress for a month, the nostalgia factor of that drama gets me until now and I became fan of yamada cause of that. Movies like Departures, nobody knows, fish story, tegami, ozosaki no hiwari and just recently taisetsu no koto made me feel this too.