Maison Ikkoku: Ikkoku-tou Nanpa Shimatsu ki

めぞん一刻番外編 一刻島ナンパ始末記

Yotsuya and Ichinose are enjoying a hot afternoon when they recall the time that the tenants of Ikkoku-kan and Mitaka go off on a cruise to party hard aboard Mitaka`s new boat. However, the boat falls apart and everyone is shipwrecked on a deserted island. With everyone up to their usual antics and shenanigans, what can happen in such a desolate place?

(Source: AniList.co)