He watches Rilakkuma and Kaoru and it’s only a little bit because he has a crush on Kaoru.
It’s also because it makes him think of his friend in Japan, and he likes to do that.
It’s also because he’s learning Japanese and he thinks it’s good to copy Kaoru’s pronunciation.
It’s also because he likes the simplicity of Kaoru’s life. A job that doesn’t matter. Time to view the cherry blossoms and the fireworks. Friends that don’t talk too much, or at all. Tea.
If he entered Kaoru’s world, he think he would be quite happy holding her under the blankets and looking out the window with her.
But he also knows that, actually, he would get tired of her in time.
And he also knows that, actually, she is a doll.