Trained by the Hokage, Surely It's Fine If I Know a Little Water Release

After seeing his father off in this life, Jiang Xi discovers several very old scrolls and a letter while sorting through his belongings. He casually pulls one out and takes a look. The words “Mutual Multiplying Explosive Tags?” are written plainly on it. Why would the Second Hokage's forbidden jutsu be in this shabby little house of his? It isn't until Jiang Xi finishes reading the letter that he understands: “Konoha welcomes me.” “I really only know a tiny bit of Water Release,” Jiang Xi says, holding his fingers a short distance apart. (Multiple heroines)