(Japanese: 聖天使クロスニアハート), tracked under the product code RJ01320589 , is a popular indie adventure RPG developed by ShiBoo! and distributed internationally by publisher Saikey Studios .

If you enjoy the style of Shimobashira Workshop, you might also look into titles from other high-profile doujin circles or explore detailed walkthroughs for similar action-heavy games on platforms like Steam Community to master specific mechanics or unlock all achievements.

(e.g., a doujin, game, ASMR, or manga):

Every product hosted on Japanese doujin distribution networks receives a unique identification code.

A prominent search result for "Seitenshi" is from the light novel and anime series Black Bullet . This Seitenshi is a 16-year-old girl and the benevolent governor of the Tokyo Area. Her appearance is starkly different from the game's heroine; she has pale skin, light blue hair, and wears an elegant white dress. However, the thematic link lies in the name "Seitenshi," which translates to "Holy Emperor" or "Sacred Ruler," a title that evokes power, protection, and a sense of divine duty.

Positioning matters heavily to avoid enemy AoE (Area of Effect) attacks.

The story begins with , a high school boy with a gentle, unassuming personality. After a tragic traffic accident, he awakens to find himself held in a mysterious laboratory, bound with an unusual sensation in his chest. His savior is a strange young girl in a lab coat, a former researcher betrayed by the criminal organization she once worked for— Despercoia （デスパコイア）.

The game alternates between narrative-driven progression and open-city tactical exploration.