I have read ousama game kigen and ousama game renda hitori.

This manga have 4 title series that coonect each other like prequel-sequel thing

Ousama kigen was the first story, then it continued to ousama renda hitori as the sequel, after that, the mc transfer school and the new story start at another sequel called ousama game shukkyou.

My question is, there is one series called ousama game rinjou, whos the prequel before ousama shuukyou, what the story about shuukyou? I heard the mc was Honda Natsuko, whos the twin sister of Honda chienmi(she already die and she was the gf of nobuaki the mc of hitori and shukkyou).

But at shukkyou, it seems Natsuko are clueless about ousama game ?

Both shukkyou and rinjou have not been translated and i was just curious about it. Shukkyou only have 1 chapter translated.

Shukkyou does not have any info at all, even the summary was blank on baka update. But what i heard rinjou was the prequel before shukkyou.