This looks like a nice little romantic story. Marisa makes tea for the two of them, and Reimu confesses. A month later, they appear to be living together, but Marisa sees things becoming routine, and demands Reimu tell her exactly how she feels. Reimu tries to express it without saying it, but Marisa is devastated that Reimu won't tell her she loves her. Demonstrably, though, this is just because Reimu is too stoic to express herself, and after noticing that Marisa has quietly sunk into depression over it, she does relent by the end.