a pattern of scattering autumn leaves in a flowing river / (figuratively) bleeding like a blood-red river flowing

(gay and lesbian slang) top

(Hokkaidō, colloquial) bye, see you later

multiple answers

official notice

stem or continuative form of 達する (tassuru) [suru]

shoulder pain

(Japanese mythology) the sixth god to come into existence, after 天常立 (Ama no Tokotachi) and before 豊雲野 (Toyokumono)

立ち食い: eating while standing

腹が立つ: get angry, take offence.