Isn't it hashimoto that 'salted salmon' likes?..
See, thought so too at first, but doesn't salted salmon ask UMA/Shirase to invite him to an offline meeting next time?
No, it was Hashimoto who he asked to meet again in the future.
http://www.mangago.zone/read-manga/online_game_nakama_to_sashi_off_shitara_shokuba_no_onijoushi_ga_kita/uu/mpn_chapter-2362146/pg-15/
Okay, so salted salmon asks aaaaa and UMA both for another offline meeting!
Well then he asked both of them, not just UMA/Shirase
Ahh, so "salted salmon" aka komatarou likes Shirase aka UMA-san, which is why he teased Hashimoto aka aaaaaa about flirting so much in the game, to get Shirase's attention. Well, we know it's going to be salted salmon interference but Shirase and Hashimoto together at the end.