Looks like there's some more recent Haachama news. Hoshikawa went to Shabu Shabu with her:
According to Haachama's Fan Discord these are the main tidbits of information with the timestamp:
11:26: Last watermelon game stream she said on stream "I'm hungry, I wanna eat Shabu-shabur". After the stream, she saw a LINE message from Haachama saying "wanna eat shabu-shabu?". Seems like she was watching the stream. so they went together
17:00: The shabu-shabu was an all-you-can-eat. It was the first time she ate till she felt like exploding. They walked 2 stations worth of distance together
27:46: Haachama recently has been learning a new song. She asked HSKW to guess, but HSKW replied "oh that's good (monotone)". it was a song she asked HSKW if she wants to sing together previously. HSKW said oh what is it but Chama replied "eh, i wonder?".
3:32:24: "If I say I want to eat X, Haachama might invite me." but she ate shabu-shabu to the point of vomiting so she doesn't wanna eat it anymore
3:34:22: Haachama once said "HSKW you have poor taste (for food) right? I saw a clip of it". HSKW doesn't think so but then again, she can't tell good meat apart in shabu-shabu places. So cheap all-you-can-eat suits her better
4:23:46: She's listing who among her friends are good at directing how to eat stuffs. Haachama for shabu-shabu. Inuyama Tamaki for Kani and Fugu, etc
4:29:24: There was a lamb meat shabu-shabu festival but Haachama wasn't interested. They decided over a rock paper scissor. HSKW lost so they went to a normal beef one.