Here's a rough translation I made based on the
Japanese walktrough :)
I do not take credits for the awesome original walktrough.
Shiraishi Kuranosuke
Day 1 July 27th
Prologue >> get [テニス / Tennis] keyword
Day 2July 28th
4:00 PM >> talk to Shiraishi (administration cabin)
8:00 PM >> talk to Shiraishi (administration cabin)
Night >> talk to Tsujimoto (automatic), choose Shiraishi >> 「白石さんかな…」
Day 3 July 29th
10:00 AM >> talk to Tooyama (administration cabin) >> get [毒手 / Poison Hand] keyword
10:30 AM >> talk to Shiraishi (kitchen) >> use [テニス / Tennis] keyword
11:00 AM >> talk to Shiraishi (kitchen) >> use [毒手 / Poison Hand] keyword >> 「毒が怖いです」
11:30 AM >> talk to Shiraishi (lodge) about chess problem
Noon >> automatic event
2:00 PM >> talk to Shiraishi (work: picking up firewood) >>「家でのんびり」 or 「友達とショッピング」
2:30 PM >> talk to Shiraishi (work: picking edible wild plants) >> mini game
3:30 PM >> talk to Shiraishi (square) >> touch communication* >> 「はい、いいですよ!」
4:00 PM >> talk to Shiraishi (resting area)
4:30 PM >> talk to Chitose (administration cabin) >> get [聖書(バイブル) / Bible] keyword
7:00 PM >> talk to Shiraishi and Tooyama (lodge) about bayberry (yamamomo)
7:30 PM >> talk to Shiraishi (administration cabin) >> use [聖書(バイブル) / Bible] keyword
8:00 PM >> talk to Shiraishi (lodge)
8:30 PM >> talk to Tooyama (logde) >> get [オサムちゃん/ Osamu-chan] keyword
Night >> talk to Tsujimoto (automatic), choose Shiraishi >> 「白石さんかな…」
Day 4 July 30th
10:00 AM >> talk to Chitose (resting area) >> get [部長/ buchou] keyword
10:30 AM >> none
11:00 AM >> talk to Shiraishi (administration cabin) >> 「順調です」
11:30 AM >> talk to Shiraishi (square) >> touch communication* >> 「はい、いいですよ!」
2:00 PM >> talk to Shiraishi (administration cabin) >> use[部長/ buchou] keyword
2:30 PM >> talk to Kenya (resting area) >> get [健康グッズ/ healthy products] keyword
3:00 PM >> talk to Shiraishi (search) >> 「興味があります」 >> either of them is OK >> 「まさか『クーちゃん』」 >> 「化学」 >> 「はい、ありがとうございます」>> get CG (white rose)
7:00 PM >> talk to Kenya (square) >> get [好みのタイプ/ favorite type] keyword
7:30 PM >> talk to Shiraishi (lodge >> use [健康グッズ/ healthy products] keyword
8:00 PM >> talk to Shiraishi (lodge)
8:30 PM >> talk to Shiraishi (logde) about pet bottle >> get CG
Day 5 July 31th
10:00 AM >> talk to Shiraishi (administration cabin)
10:30 AM >> talk to Shiraishi (resting area)
11:00 AM >> talk to Shiraishi (resting area)
11:30 AM >> talk to Shiraishi (kitchen: cooking duty)
2:00 PM >> talk to Shiraishi (square)
2:30 PM >> talk to Shiraishi (work: drawing water)
3:00 PM >> talk to Shiraishi (square) >> touch communication* >> 「はい、いいですよ!」
3:30 PM >> talk to Chitose (resting area) >> get [好きな食べ物 / Favorite food] keyword
4:00 PM >> talk to Shiraishi (administration cabin) >> see Shiraishi and Tsujimoto together
4:30 PM >> talk to Shiraishi (administration cabin) >> Shiraishi apologize (feather and flower petals)
Evening >> automatic event (talk about hospital ruins part 1)
7:00 PM >> talk to Shiraishi (logde) >> play trump card >> 「真ん中」
7:30 PM >> none
8:00 PM >> talk to Shiraishi (administration cabin)
8:30 PM >> talk to Shiraishi (administration cabin)
Night >> automatic event (talk about hospital ruins part 2)
Day 6 August 1st
Morning >> automatic event >> awakened by Shiraishi
10:00 AM >> talk to Shiraishi (square) >> date >> use [オサムちゃん/ Osamu-chan], [好きな食べ物 / Favorite food], and [好みのタイプ/ favorite type] keywords
2:00 PM >> automatic event (discover hospital ruins) >> get CG
Day 7 August 2nd
Talk to Tsujimoto (automatic), choose Shiraishi >> 「蔵ノ介さん…よね、やっぱり」 >> confession >> get CG
*touch communication
stage 1 >> hair
stage 2 >> Shitenhouji emblem
stage 3 >> lips
Comments and corrections (if any) are really appreciated!
edit: fixed some mistakes :)