School Days HQ
Summary
In the school the three people met. Their relation had been changed in the season, and turned into three love stories.
Makoto has been admiring a girl he has seen on the train. That girl is Kotonoha Katsura, and he even managed to take a photo of her with his cell phone. Due to new seating in his class, he ends up next to Sekai Saionji, a nosy, but sweet and sincere girl. As she snoops for his cell phone while talking to him, she discovers his crush and vows to help him until Kotonoha agrees to go out with him. When Sekai finally gets them together, she realizes her own feelings after finding out that the person Kotonoha liked was, in fact, Makoto. While waiting for her train next to Makoto, who was waiting for Kotonoha, she has him talking about how he can repay her for all of her help. Before leaving for her train, she kisses him and cries when she boards the way home. Kotonoha happily arrives for her date with Makoto shortly after. With all three main characters carrying different expressions on their faces, the story begins.
Ending Guideline / Suggested Route Order
In School Days HQ, there's 22 possible endings for the player to experience.The endings are divided in:
Main Heroines: Kotonoha (7 Endings) and Sekai (5 Endings)
Sub Heroines: Hikari (2 Endings), Otome (1 Ending), Setsuna (1 Ending)
Two Harem Endings
And lastly 4 Bad Endings.
The route order i suggest will be the: Two main heroines Kotonoha and Sekai Endings, Sub heroines Endings, Harem Endings and lastly the (infamous) Bad Endings. The Vn has Timed Choices , the player can also use right click to increase he countdown.
School Days HQ also has built-in Flowchart , simply load and choose where you want to return to (only when you've been through the route).
Flowchart
Main Heroine Ending Guideline
Katsura Kotonoha
Christmas Eve
Lust
With Kotonoha
To Kotonoha
After the Kiss
It Begins with the First Kiss
All Hers
Saionji Sekai
I Love You
With Honesty
Bavarois
Setsuna's Feelings
Love Fulfilled
Sub Heroine Ending Guideline
Kuroda Hikari
Everyone's Makoto
Sexfriend
Katou Otome
Earnest Feelings Requited
Kiyoura Setsuna
I'm His Wife
Harem Ending Guideline
Two Lovers
Goodbye Sekai
Bad Ending Guideline
Bloody End
To My Child
Forever
Pushed Too Far
Attribution
This walkthrough is based on info attained on School Days vndb discussions and School Days ending Wiki with some adjustments made by me.