For a manga about entering someone's dream, this was probably the most bland dreamscape they could've come up with. I mean, the person dreaming is asleep inside of his own dream...And the characters don't stand out (visually or personality-wise), so we end up with a bland world occupied by bland characters. And the dream monster is clearly intended to be cute, but it's not.
Also, this manga has a problem with awkward attempts to do exposition within the dialogue, which makes the exchanges feel unnatural and stupid. Here's a couple examples:
A: "I still wonder if I'm dreaming now." B: "This is definitely a dream, but at the same time it's real. You should know that."
A: "He spends 7 hours studying after school every day...And he wants to take 10 subjects at O-Levels." B: "What are O-Levels? Is it food?"