Full Credit to Mich997 who posted the Translation on the Discord.

01 - Holy Spirit System Unlocks after clearing 5-10. Reverence, Faith, Hope, Love will initially be available and more will be gradually added.

02 - Holy Spirit Attributes Stat boosts

Holy Spirits do not directly participate in battle. They provide stat bonuses instead. Different Holy Spirits have different stat bonuses. Stat boost will increase according to the their level. Skills Holy Spirits can carry various skills to strengthen a team, including skills that can replace or strengthen the original tactical skills. Each Holy Spirit has their own exclusive skills. They can only carry up to 3 skills. Rank Holy Spirits start out at 1* and maxes at 5*. Rank determines a Holy Spirit's max level. Reaching 3* and 5* unlocks new skill slots and obtains a new skill at random

03 - Manifestation Holy Spirits can be obtained through [Holy Spirit Manifestation], and professors can consume 1 or 10 [Holy Spirit Manifestation Orders] to randomly obtain a Holy Spirit and Holy Spirit-related development items. A Holy Spirit obtained through Holy Spirit Manifestation will carry a random skill.

04 - Enhancement Upgrades

Consuming [Holy Spirit Data] will raise the Holy Spirit's level and strengthen their stat bonus. When the level cap is reached, you need to rank up to increase the cap. Max level is 50. Advanced When a Holy Spirit reaches the highest level of its current rank, you can feed a dupe that is the same rank Advancement Order to rank it up and transfer skills from the dupe. Reconfiguration When a Holy Spirit reaches Lv50, you can use any other Holy Spirit Reconfiguration Order to transfer skills from the Holy Spirit being fed.

05 - Returning You can return Holy Spirits to get some development items back.