Bright and Cheery Amnesia by Tamamusi — Ongoing

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Mari's girlfriend, Arisa, loses her memories of the past three years, including all memory of their life together. However, it turns out that being crazy in love with someone transcends all realms of possibility.

Chapter 0 released Aug 28 '16
Chapter 1 released Oct 5 '16
Chapter 2 released Dec 20 '16
Chapter 3 released Jan 25 '17