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Summer Pockets
Reflection Blue English Patch by Alka Translation is now available
Original version on Steam
Summary
Summer Pockets is set on an isolated, rural and peaceful island on the Seto Inland Sea called Torishirojima, which has a population of about 2,000 people. The protagonist is Hairi Takahara, a young man not native to the island. Hairi grew up in an urban setting, but after an unpleasant incident he uses the recent death of his grandmother as an excuse to come to the island to take care of her estate sale. Once there, he gets to know four girls who are the focus of the story. They include Shiroha Naruse, who forgot her summer vacation; Ao Sorakado, who is pursuing the legends of the island; Kamome Kushima, a high-class girl looking for a pirate ship; and Tsumugi Wenders, a younger girl trying to find herself.
Ending Guideline/Route Suggested Order
This guide mainly follows REFLECTION BLUE version as it is the definitive updated version of the game - some information might differ from your gameplay experience if you played the Steam/original version.
This game has 8 character routes present and 2 true end routes, ALKA and Pockets. Simply finish all routes except Umi (won't count to any total route clear).
The character routes has no compulsory order and no unlock requirements so you can do any order you want, but most recommended order is:
ReSTART will occur after 4th and 6th route clear, in which main menu will show the ReSTART prompt instead. We strongly recommend you to start new game on this point as there might be new scenes in the prologue and common route. Read texts will remain skippable. 
If all main 7 routes has been cleared, ALKA route will be unlocked. Finishing ALKA will lead you to Pockets, the final route.
Route Guideline
Most of these routes uses MAP system, in which you'll be able to view any scenario in various place of the island. Some of these corresponds to certain characters.
In general, in common route you need to view all scenario of your selected heroine up to August 5/6 to access one's route. When any of the time the heroine isn't available, you are recommended to visit places with neutral marks (marked !) or in case of Secret Base, Tenzen. You can try any choices that appear when visiting these places, which sometimes awards you quite valuable achievements. 
Prologue

Shiroha Naruse

Tsumugi Wenders

Shizuku Mizuori
(REFLECTION BLUE Only)

Kamome Kushima

Miki Nomura
(REFLECTION BLUE Only)

Ao Sorakado

Shiki Kamiyama
(REFLECTION BLUE Only)

Umi Katou
(REFLECTION BLUE Only)
ALKA
Pockets
After true end

EXTRA: Shimapong Tournament Arc
(REFLECTION BLUE Only)

EXTRA: Shimamon
Attribution
Seiya-Saga, readjusted to Alka Translation translation of its choices
Alka Translation simple guide of the RB version

Full Metal Daemon Muramasa (Soukou Akki Muramasa - 装甲悪鬼村正)
JAST Store page (uncensored)
GOG Store page (GOG version uncensor patch)
SUMMARY
This is not a story of heroes.

Since time immemorial, warriors called musha have ruled the battlefield, granted supernatural power by their enchanted suits of armor - tsurugi.

Minato Kageaki is one such musha, driven by duty to don his crimson armor and challenge the greatest evils of an age. But though madmen and tyrants fall to his blade, never will he claim that his battle is right.

For the tsurugi he wields is cursed Muramasa, which five centuries ago brought ruin to the land, and innocent blood is the price it demands in exchange for its terrible might.

"Where there are demons, I slay them. Where there are saints, I slay them."

These words are an oath, the unbreakable Law binding him to his armor. But they also tell the story of his past, and of the future to come.
ENDING GUIDELINE
By default, Full Metal Daemon Muramasa has 3 routes, 2 of them initially unlocked (Hero and Nemesis). Completing both routes allow you to access the true end route: Conqueror. 
Other than that, you can complete any of those routes by any order. However, it is recommended for you to go through your first playthrough blind, so you'll be able to get the full feel of this story. To give you some hints:
 ROUTE GUIDELINE

Hero Route [Ichijou Ayane end]

Nemesis Route [Kanae Ohtori end]

Conqueror Route [Evil Demon True End]

Conqueror Route [Demon End]

Conqueror Route [Devil End - Chachamaru]
Attribution
Guide from Otaku Lair - where this walkthrough is based and omitted
Seiya-Saga - guide in Japanese

Full Metal Daemon Muramasa (Soukou Akki Muramasa - 装甲悪鬼村正)
JAST Store page (uncensored)
GOG Store page (GOG version uncensor patch)
SUMMARY
This is not a story of heroes.

Since time immemorial, warriors called musha have ruled the battlefield, granted supernatural power by their enchanted suits of armor - tsurugi.

Minato Kageaki is one such musha, driven by duty to don his crimson armor and challenge the greatest evils of an age. But though madmen and tyrants fall to his blade, never will he claim that his battle is right.

For the tsurugi he wields is cursed Muramasa, which five centuries ago brought ruin to the land, and innocent blood is the price it demands in exchange for its terrible might.

"Where there are demons, I slay them. Where there are saints, I slay them."

These words are an oath, the unbreakable Law binding him to his armor. But they also tell the story of his past, and of the future to come.
ENDING GUIDELINE
By default, Full Metal Daemon Muramasa has 3 routes, 2 of them initially unlocked (Hero and Nemesis). Completing both routes allow you to access the true end route: Conqueror. 
Other than that, you can complete any of those routes by any order. However, it is recommended for you to go through your first playthrough blind, so you'll be able to get the full feel of this story. To give you some hints:
 ROUTE GUIDELINE

Hero Route [Ichijou Ayane end]

Nemesis Route [Kanae Ohtori end]

Conqueror Route [Evil Demon True End]

Conqueror Route [Demon End]

Conqueror Route [Devil End - Chachamaru]
Attribution
Guide from Otaku Lair - where this walkthrough is based and omitted
Seiya-Saga - guide in Japanese