>>3625491Taihei went out of town on a business trip with Kanau (as well as Bomba and Alex). Umaru followed him on a train because she had suspicions that Taihei and Kanau may have been dating. That is why she is pouty here
>>3624485 and here
>>3625194The eel also may have had a bit to do with her decision to follow him. I don't remember the name of the place they visited, but apparently a specialty of the town is eel. Taihei and Umaru sat down and had some eel for lunch before Umaru went back home after discovering that Taihei and Kanau weren't dating. The eel was delicious.