Vita3K Android (for the first two games) or Skyline/Yuzu (for the third game via Switch emulation).
The Oregairu VNs were never officially released in English. To enjoy them on Android, you will need to apply fan-made English translation patches.
Yahari Game demo Ore no Seishun Love Come wa Machigatteiru. Kan (Adapts Season 3) How to Play on Android