越前龍馬閉上眼睛，腦海中回放着比賽中的每一個細節。

那些他曾經需要刻意去思考、去判斷的瞬間，在那個境界中，身體會自動做出最正確的反應。

不需要思考，不需要猶豫，彷彿網球本身就是他身體的...

秦九子馬盯着聊天羣左下角那行淡金色的提示，指尖無意識地摩挲着網球拍光滑的拍柄。汗水沿着額角滑落，在水泥地面砸出一小片深色痕跡。他沒說話，只是緩緩蹲下身，從球袋裏掏出一瓶礦泉水擰開，仰頭灌了一大口。水珠順着他下頜線滑進運動服領口，涼意卻壓不住腦海裏翻湧的驚濤駭浪。

記憶副本的標題是《零式發球·終焉迴響》，封面卻不是他熟悉的青春學園紅白校服，而是一片崩裂的蒼穹——天幕如碎玻璃般蛛網密佈，裂縫深處透出幽藍電光；下方是一座懸浮於虛空中的巨型網球場，地面由凝固的雷漿構成，球網竟是無數旋轉的微型黑洞構成的引力鏈。而站在球場中央的人，是他自己，但又不是他。那人左眼燃燒着銀白色火焰，右眼瞳孔分裂成十二重同心圓，握拍的手背上浮現出青銅色鱗片，指節間跳躍着壓縮到極致的暗物質粒子流。

“這……不是漫畫分鏡。”他低聲說，聲音乾澀得像砂紙摩擦。

他點開了副本。

第一幀畫面是東京灣上空的黃昏。他正站在廢棄的東京塔觀景臺邊緣，腳下是整座沉入暮色的城市。風很大，吹得他球衣獵獵作響。對面三米處，一個穿黑色西裝的男人背對着他，手裏託着一枚懸浮的網球——那球表面沒有一絲絨毛，通體漆黑，內部卻有星雲緩慢旋轉。男人開口，聲音像兩塊大陸在海底碰撞：“秦九子馬，你終於來了。‘零式’不是終點，而是座標。”

下一秒，男人轉身。秦九子馬瞳孔驟縮——那是他自己的臉，但眼角有三道血痕，額心嵌着半枚破碎的齒輪狀晶體，瞳孔裏倒映的不是東京灣，而是無數重疊的網球軌跡，每一道都標註着時間變量與空間曲率參數。

副本戛然而止。

他猛地抬頭，發現聊天羣界面右上角多了一個紅色小點，點開後跳出一行字：【檢測到宿主精神波動異常，自動觸發新手保護機制——已屏蔽97.3%的記憶副本殘留信息。剩餘3%爲安全閾值，可自主查看。】

他閉了閉眼，再睜開時，視野邊緣浮現出三行微光文字：

【當前世界層級：高武（隱性）】

【核心規則：球技即法則】

【危險提示：本世界存在‘球路坍縮現象’——當某項球技被重複使用超過七次，該技能所關聯的物理常數將發生永久性偏移。】

“球技即法則……”他喃喃自語，忽然想起上週練習時打出的那記超高速截擊。當時球速計顯示214km/h，可落地瞬間，球場西側的電子記分牌突然集體跳變成二進制代碼，持續閃爍了十七秒。教練以爲是電路故障，他卻清楚記得，自己揮拍剎那，耳畔掠過一聲類似古鐘鳴響的嗡鳴。

他攥緊球拍，指節發白。

這時，聊天羣彈出新消息：

普普通通的羣主：“@秦九子馬，剛纔的副本，你看到了什麼？”

秦九子馬手指懸在鍵盤上方，遲遲未落。他想起副本裏那個“自己”額心的齒輪晶體——那東西他曾在父親書房的舊相冊裏見過。去年整理遺物時，他翻出一本泛黃的《昭和年代機械工程圖鑑》，其中一頁夾着張褪色照片：年輕時的父親站在某研究所門口，胸前工牌上印着模糊的徽標，徽標中心正是半枚齒輪。照片背面用鋼筆寫着：“第七代‘弦理論球體’原型機，1983年，失敗。”

他喉結滾動了一下。

秦九子馬：“我看到了……我父親。”

羣裏安靜了兩秒。

燈塔首富：“你父親？那個世界也有穿越者？”

幹物妹小埋：“等等！他剛纔是不是說‘我父親’？不是‘我的父親’？”

霞詩子：“語法錯誤……還是某種暗示？”

普普通通的羣主：“@秦九子馬，詳細說說。”

秦九子馬深吸一口氣，把照片的事、電子記分牌的異變、以及副本裏那個“自己”額心的齒輪晶體全說了。他沒提相冊藏在自家閣樓第三層木箱底層——那是母親臨終前親手釘死的箱子，鑰匙早已熔成鐵水澆進了院中那棵櫻花樹的根部。

消息發出去後，羣聊界面突然劇烈閃爍。所有頭像圖標同時變灰，緊接着，每個羣員頭像旁都浮現出一行血紅色小字：

【警告：檢測到跨世界因果錨點激活】

【錨點源：秦九子馬·父系基因鏈】

【關聯事件：1983年‘弦理論球體’實驗事故】

【風險等級：橙色（可能引發局部時間褶皺）】

波風水門的消息幾乎是立刻跳了出來：

金色閃光：“立刻停止任何與‘齒輪’‘弦理論’‘1983年’相關的思考！林羽，把你的千手血脈查克拉調頻器借他用一下——頻率設在137.036THz，這是真空磁導率諧振點，能暫時屏蔽因果擾動。”

蘇雲清緊隨其後：

普普通通的羣主：“林羽，快！”

林羽正蹲在木葉村後山溪邊洗野果，聞言手一抖，竹籃裏的草莓滾進水裏。他慌忙撈起，指尖滲出淡青色查克拉絲線，在掌心纏繞成個巴掌大的透明球體——球體表面流動着細密的金色符文，像液態的蜂巢。他咬破手指往球體上一抹，查克拉立刻沸騰起來，化作一縷極細的金線射向遠方。

遠在東京的秦九子馬突然覺得太陽穴一燙。他抬手摸去，指尖沾到一點溫熱的金粉，那粉末剛觸到皮膚就滲進血管，順着血液奔湧至四肢百骸。剎那間，他聽見無數聲網球撞擊球拍的脆響在顱內炸開，每一聲都帶着不同頻率的震動，最終匯成穩定的嗡鳴。視野裏，那些血紅色警告字跡開始溶解，像被雨水沖刷的墨跡。

秦九子馬：“謝了……等等，我怎麼能看到你們的查克拉顏色？”

林羽：“……你剛纔看到的是我的千手血脈共鳴頻譜。現在你右眼視野邊緣應該有個淡金色小點，那是查克拉穩定器的投射點。別揉，會散。”

秦九子馬下意識眨了眨眼。果然，在視野右下角，一枚芝麻大小的金點靜靜懸浮，像顆凝固的星辰。更詭異的是，當他凝視那金點時，周圍空氣開始扭曲——球館頂棚的日光燈管在他眼中拉長成螺旋狀光帶，水泥地面浮現蛛網般的金色裂紋，而裂縫深處，隱約有無數個正在揮拍的“自己”重疊閃現，每個動作的毫秒級差異都纖毫畢現。

小越前龍：“喂，新人，別盯着看太久。那是‘多重時間切片觀測’，你現在的神經突觸還沒進化出處理能力，再看三秒就會鼻腔出血。”

話音未落，秦九子馬鼻子裏就湧出一股溫熱。他手忙腳亂掏紙巾，卻見紙巾盒側面映出的倒影裏，自己左眼瞳孔正緩緩旋轉，形成微小的漩渦。

託尼：“有意思。他的生物電場正在和千手查克拉產生量子糾纏……等等，這糾纏態怎麼在自發疊加？”

燈塔首富：“林羽，你確定沒搞錯頻率？這玩意兒在幫他生成臨時性的‘時間感知緩衝區’。”

林羽：“……我照着系統給的參數調的。它說這是‘最基礎的因果隔離頻段’。”

系統智能的聲音突然在林羽腦內響起，帶着罕見的凝重：“宿主，你剛纔是不是……把千手血脈的原始頻率，和網球王子世界的‘球路法則基頻’耦合了？”

林羽一愣：“什麼耦合？”

“就是你調頻時，把137.036THz這個數值，和網球王子世界所有球技的‘最小作用量’——也就是0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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