Summary pulled directly from Steam - Some text may only be applicable to Steam platform

"Butterfly's Poison; Blood Chains" is a visual novel that depicts a mature love story.
It was first released in Japan as "Chou no Doku, Hana no Kusari (蝶の毒 華の鎖)", and while the original game contained adult content and was unsuitable for minors, it was later remade to meet the appropriate ratings for video game consoles and distributed worldwide as "Chou no Doku, Hana no Kusari: Taisho Tsuyakoi Ibun (蝶の毒 華の鎖～大正艶恋異聞～)" (ESRB M / PEGI 16 / USK 16 / CERO D).
This game is a Steam port of the console version.

・Includes all the additional upgrades of the console version
All of the visuals and additional stories added to the previous console port have been implemented in the Steam version.

・Fully voiced (excluding the main character)

・The text can be set to English or Japanese
This includes in-game text, options, and the digital manual. Language settings can be changed at any time.
(Voices and the text in the opening movie and credits will be displayed in Japanese.)

・Touch gestures can also be used if you're playing on a tablet PC or a Steam Deck