Reviewed work by Platonic Knights · View on DLsite
Summon Spirits is a solo deck-building card game wrapped in an RPG Maker shell, from circle Platonic Knights — and its big hook is that, unlike the usual roguelike deck-builders, your card collection never resets. It’s aimed squarely at people who want to slowly assemble a card pool over multiple runs and tinker with builds, with a side of thoroughly vanilla, consensual H content as the reward loop. If your ideal doujin game is “actual card game first, porn second,” this one is talking directly to you.
What works
The structure is genuinely more interesting than the average card-battle H-game. Instead of resetting your deck every run, everything you collect accumulates permanently. The main scenario plays out as a turn-based adventure — one event per turn, with a pool of events that appear and shift dynamically, and you pick which to pursue. Your goal is to climb a city-wide battle ranking to first place within a turn limit. Miss the deadline and it’s technically a game over, but you keep your entire card pool and even get a ranking boost on the next run, so failure is really just another lap of collection. The developer says most testers cleared it on their second or third cycle, and the design clearly intends that: you’re not repeating content so much as compounding progress. The main scenario runs around eight hours, plus two or three more if you complete every H event, at a standard-to-slightly-easy difficulty.
The circle claims twenty-plus years of card game study went into this, and while that’s marketing, the supporting evidence is decent: the game shipped with deliberate balance passes (overtuned cards nerfed, weak concepts buffed), and the post-release update log shows continued rebalancing of status effects like Silence and Blind with matching AI behavior changes. That’s a level of ongoing card-design maintenance you rarely see in doujin releases, and community reception since launch has been notably positive for exactly this reason — people are treating it as a real card game, not a minigame with CGs stapled on.
The H side is small but intentional. Six heroines (five main plus one hidden) and fifteen H scenes, unlocked through a clean loop: raise a heroine’s affection in the scenario, challenge her to a “serious battle” that doesn’t affect your city ranking, and win to trigger the scene. Most heroines have three battle tiers, with stronger decks and lewder scenes at each step. The tone is explicitly wholesome — one-on-one, lovey-dovey, consensual sex where nothing bad ever happens to the heroines (the male protagonist can be a bit pushy, but that’s the ceiling). Tags run to a harem cast with oral finishes, creampies, and bukkake. Each scene carries 1,500–2,000 characters of text with its own theme, and the CGs get background art — a small thing, but a real rarity in doujin erotic RPGs and a sign of where the circle set its quality bar.
What doesn’t
The most honest criticism comes from the developer’s own patch notes: the graveyard-effect system is unstable. As of version 1.1 there are three acknowledged graveyard-related bugs still open (duplicated victory sequences, discard steps failing to resolve, cards stuck in the graveyard on deck-out), and the circle says the system may need a major script or card-design overhaul. Worse, there’s a game-freezing crash against Beast-class CPU opponents under multiple status effects that the developer hasn’t been able to reproduce yet. The circle is responsive — a dedicated support channel exists and fixes are shipping — but right now you’re buying a card game whose most interesting mechanic is also its buggiest.
The other trade-off is H density. Fifteen scenes across a ten-plus-hour game is lean, and the circle openly frames it as “few but polished” rather than volume. If you measure doujin RPGs by scenes-per-hour, this will feel thin, and the deliberately safe vanilla tone means there’s no edge or escalation beyond “lewder as affection rises.” The card game is the meal here; the H content is dessert.
Who should buy this
Be aware this is Japanese-only, with no official English support — and it’s a bad pick for non-readers. A deck-builder lives on card effect text, and this one adds a turn-based adventure layer and 1,500–2,000 characters of prose per H scene on top. Since it’s built in RPG Maker, a texthooker plus machine translation is viable and the gameplay loop itself (battle, climb ranking, collect cards) is learnable through play, but expect real friction parsing card effects and event choices. Buy it if you read Japanese or are comfortable playing card games through MTL and want a mechanically serious deck-builder with warm, consensual H scenes. Skip it if you want scene volume, dark content, or a game you can enjoy purely visually.
Verdict
7 / 10. Summon Spirits is that rare doujin release where the game design is the actual product — a persistent-collection deck-builder with smart failure-tolerant structure and an active, balance-minded developer — held back from a higher score by acknowledged instability in its graveyard mechanics, a modest fifteen-scene H count, and a text load that makes the Japanese-only barrier steeper than usual.
This is the Japanese-language store. International credit cards and PayPal are accepted. The game itself is in Japanese.
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