The anime you are looking for is “With You, Our Love Will Make It Through” (Japanese title “Kimi to Koete Koi ni Naru”).

Official streaming

• The series is available to stream legally on Crunchyroll with both sub and dub options.

• Aggregator sites like JustWatch list it as streaming on Crunchyroll and via the Crunchyroll Amazon Channel in some regions, and also note that purchase options exist on services like Apple TV and Amazon Video. Availability can vary by country, so checking region settings there helps.

Other online options

• Some unofficial anime streaming sites list the show under titles like “Kimi to Koete Koi ni Naru” or “With You, Our Love Will Make It Through,” but these are not licensed and may be unsafe or infringe copyright.

• There are also promotional clips and the first episode preview on YouTube from official channels that can be watched for free, though not usually the entire series.