that name "Ли́лия Алекса́ндровна Подкопа́ева" is probably based on this person, who is Ukrainian.... https://ru.wikipedia.org/wiki/Подкопаева,_Лилия_Александровна
so Hachinoi Eiji really is the original, since he knows the past of Shinmiyoji, and Urashima Eiji doesn't know very much about her (as gloomy girl what he describes in chapter 1). Curious when Rei discovered the double personality of Eiji, seems she care for Urashima.
Oh, and I think actually...
I'm considering SL as an isekai, because basically the main male character was actually resurrected. Baka-updated also consider this as an isekai (reicarnation).
https://en.wikipedia.org/wiki/Isekai in other words, Solo Leveling partially is an isekai.
Rorik of Dorestad is based on this personage - https://en.wikipedia.org/wiki/Rorik_of_Dorestad ; as there have suggestion he is also Rurik who is alleged to be the founder of Kievan Rus (this country actually have nothing with now-today Russia, whose origin is from Moscow).
And the Battle of...
@phoseryn seems there are two pages which are not well cut-off fixed; first the panel after the panel with "But, the man shrouded in flames" (page 11); and second, the panel after the bubble "Today, the pureblood visited the market" (12 page).
...the artist could remove the shirt at least...
P.S. What is wrong with no MILF? A young 20 years old girl surely is better than a woman over 40 years...
so 22 days(02 October-23 October) before Eiji Kyouka already met with her father and forced him to meet with Hatanaka, as she is related to Sai Yashiro... one thing shoyld be clear: Kyouka maybe prefer B-1 than Eiji, sine B-1 cooperated first with Shouto...
Most likely the reason why Kyouka...
the sentence "these people are definitely my parents" is repeated twice in the flashback of her mother (the middle panels), I wonder it is wrongly repeated. @Suiji01z
...so.... Eiji's problems have added.... first his double personality, B-1; then the gloomy girl Shinmyouji Rei.... which seems to have hided some things while in collab with Eiji vs. Sai...., and now the true face of Kyouka...