The biggest headache when playing *Perseus of the Summer Sky* is not knowing which route to pick. This game looks like it has few choices, but it hides a plot lock—if you don't follow the order, you can't unlock Touka's route. Today's guide breaks down the complete walkthrough for all four heroines, marking every save point and choice branch clearly. Just follow along and you'll collect every ending.
New Player Must-Read: *Perseus of the Summer Sky* is a 2012 Galgame by minori, the "chūni" studio. It tells the story of the Tohno siblings, who possess the ability to transfer others' pain, fleeing to the rural village of Tenryou where they meet four girls. The game only has one choice point, but Touka's route won't unlock until you've cleared Koi, Midori, and Ayame's routes. I recommend playing in the order Koi → Midori → Ayame → Touka for the smoothest story experience. Each route takes 4-6 hours, roughly 15 hours for full completion.
Quick Navigation
1. Tohno Koi Route Walkthrough
2. Minagawa Midori Route Walkthrough
3. Hishida Ayame Route Walkthrough
4. Sawatari Touka Route Unlock Conditions
5. Important Notes
Tohno Koi Route Walkthrough
Koi is the real younger sister route and the first stop of the plot lock. Like her brother Shinra, she has the ability to transfer pain, but her power is stronger than his.
1. Progress through the common route to the choice point, save as SAVE01
2. Select Flower Field
3. Enter Koi's personal route, watch the ending to unlock the CG
Koi END
Minagawa Midori Route Walkthrough
Midori is the athletic girl with a leg injury preventing her from swimming. She's cheerful on the outside but timid inside. Start from SAVE01 for this route—no need to replay the common route.
1. Start from SAVE01
2. Select Stream (riverside)
3. Enter Midori's personal route
Midori END
Hishida Ayame Route Walkthrough
Ayame is the bookish girl whose parents died in a car accident six months ago, leaving her traumatized. She's the oldest of the three and handles teaching duties alongside Touka.
1. Start from SAVE01
2. Select Library
3. Enter Ayame's personal route
Ayame END
Sawatari Touka Route Unlock Conditions
Touka is the true heroine of this game and the core of the plot. Her route contains major story reveals and only unlocks after completing the above three routes.
Unlock Conditions:
1. Must complete Tohno Koi, Minagawa Midori, and Hishida Ayame's routes
2. Return to the title screen, select New Game to start a new game
3. New scenes will appear in the common route, with new options at the choice point
Important Note: When playing Touka's route for the first time, the options marked in parentheses won't appear. You must be on your second playthrough or later to see the (Watchtower) option.
1. After clearing all three routes, select New Game from the title screen
2. Progress to the new choice point, select (Watchtower)
3. Enter Touka's personal route, watch the true ending
Touka END
Important Notes
1. This game only has one choice point, but the options change based on progress. The Watchtower option for Touka's route is hidden and invisible on your first playthrough.
2. Save files are located under /mnt/kimi/output—I recommend backing up your saves after clearing each route.
3. Touka's route has the most content and the strongest emotional impact, so save it for last.
4. Full completion unlocks the gallery mode, where you can review CGs and music.
Walkthrough complete. *Perseus of the Summer Sky* may be short, but the story reveal in Touka's route is worth the buildup from the first three routes. Tenmon's BGM paired with the sunflower field scenes creates an incredible atmosphere. Take your time and don't rush through the story. Hope you all get to see the true ending's story reveal.
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