Exorcist's Self-Cultivation - Chapter 615 - 612 Sunk into the Sea

A side story series featuring the girls of Kyoukai Senjou no Horizon.

Chen Qiu had transmigrated to an Immortal World, where in this world of immortals— there were Heavenly Dao Decrees, a panel-like “Heavenly Pride Leaderboard,” and numerous entries. ... Every cultivator, upon breaking through a Great Realm, could obtain an entry. Different entries combined to define the cultivator’s limits and directions for development. Some cultivators relied on the entry combination of “Nine Ox Power” + “Hundred Percent Accuracy” + “Ignore Barrier” to marry into the Dragon Clan and became the greatest Beast Master in history. Others relied on the entry combination of “Nonsensical Babble” + “Deceive the Junior, Fool the Senior” + “Martyr’s Command,” becoming the greatest State Preceptor in history. Meanwhile, Chen Qiu’s first entry, “Rise Through the Ranks,” allowed him to choose one out of three random entries each time he broke through a small realm. From then on... Various entry fusion techniques, astonishing the human world! ... When everyone in this world had a golden finger, it all came down to whose destiny was tougher!

Roy died during a war against the Evil God Cult, but somehow, he returned back in time to 30 years in the past where he was just a boy who awaken his summoning magic.

The boy who Sneaks in My Bedroom Window