Take the context clues from last chapter , Seichi isn't literally dead, but inside of Seiko's mind seichi has been 'killed' off and is apart of the rest of her dissociative world
Welp that’s it, dropped, translators I wanna KISS TF OUT OF YOU, you all did a great job in the end but this damn manga/mangaka has gotten so wishy washy and that’s my final straw, started great, got too artsy and now just a clusterfuck of bordem